Skilled Trades Study Guides
Browse 298 free skilled trades study guides. Choose an exam family or open a guide with chapters and explanations.
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AACE Certifications
AACE certification exam prep with certification guides, practice questions, flashcards, and coverage for cost estimating, project planning and scheduling, earned value management, risk analysis, forensic claims, and project controls.
ABC Water Operator Certification
ABC water operator certification prep with study guides, practice questions, flashcards, and coverage for water treatment, distribution, wastewater treatment, collections, math, and safety.
ACI Concrete Certifications
ACI Concrete certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for concrete testing, mix design, field inspection, shotcrete application, structural repair, and quality control procedures.
Amateur Radio Licenses
Amateur Radio licensing exam prep with official handbook study guides, practice questions, flashcards, and coverage for FCC regulations, operating procedures, radio wave propagation, antenna theory, electrical principles, and safety.
American Welding Society Certifications
American Welding Society certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for weld quality, inspection methods, codes and standards, metallurgy, welding processes, and safety.
AMPP Certifications
AMPP corrosion and cathodic protection certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for corrosion science, cathodic protection design, inspection methods, coatings, electrochemistry, and failure analysis.
API Inspector Certifications
API Inspector certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for pressure vessel inspection, piping systems, risk-based inspection, welding metallurgy, corrosion mechanisms, and pipeline construction.
ASNT NDT Certifications
ASNT NDT certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for ultrasonic testing, radiographic testing, magnetic particle testing, liquid penetrant testing, visual testing, and eddy current testing.
ASSE Plumbing Certifications
ASSE plumbing and medical gas certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for backflow prevention, cross-connection control, medical gas systems installation, fire protection piping, and program administration.
Boiler Operator
Boiler Operator licensing exam prep with state and trade guides, practice questions, flashcards, and coverage for boiler construction, steam systems, fuel combustion, safety controls, water treatment, and pressure vessel regulations.
Canada Red Seal Interprovincial Trades
Canada Red Seal Interprovincial (IP) trade exam prep with practice questions, flashcards, and study guides covering the multiple-choice Red Seal Occupational Standard exams for skilled trades — construction, mechanical, automotive, industrial, and service trades — that let certified journeypersons work across all participating provinces and territories.
Canadian Provincial Pesticide Applicator Exams
Canadian provincial pesticide applicator core exam prep, with practice questions covering pest management, labels, and safe application.
City & Guilds UK Trade Qualifications
City & Guilds UK trade qualification exam prep with practice questions, flashcards, and study guides covering the online multiple-choice knowledge tests for electrical installation (2365/2382/2391), plumbing and heating, carpentry and joinery, painting and decorating, bricklaying, and gas, aligned to BS 7671 and UK building standards.
Electrician License
Electrician licensing exam prep with state and trade guides, practice questions, flashcards, and coverage for code, wiring methods, calculations, safety, and electrical theory.
EPA Lead Inspector and Risk Assessor
EPA Lead Inspector and Risk Assessor certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for lead-based paint regulations, inspection protocols, risk assessment, sampling methods, and HUD guidelines.
FCC Radio Operator Licenses
FCC Radio Operator License exam prep with trade and licensing guides, practice questions, flashcards, and coverage for radio regulations, antenna theory, distress procedures, GMDSS equipment, maritime communications, and radar systems.
Fire Alarm Installer
Fire Alarm Installer licensing exam prep with trade and licensing guides, practice questions, flashcards, and coverage for NFPA 72, circuit design, initiating devices, notification appliances, system wiring, inspection, and testing.
Funeral Service National Board Exam (NBE)
Funeral Service National Board Exam (NBE) prep with practice questions and coverage for the Arts section (funeral directing, arrangement, law, and ethics) and Sciences section (embalming, restorative art, microbiology, pathology, and anatomy) administered by The International Conference of Funeral Service Examining Boards.
GBCI Sustainability Credentials
GBCI credentialing exam prep with practice questions and coverage for WELL AP healthy-building strategies, SITES AP sustainable landscapes, TRUE Advisor zero waste, and EDGE Expert resource-efficient design, all administered by Green Business Certification Inc.
General Contractor License
General contractor licensing exam prep with state guides, practice questions, flashcards, and coverage for construction law, project management, estimating, safety, contracts, and building codes.
HVAC Contractor License
HVAC contractor licensing exam prep with trade guides, practice questions, flashcards, and coverage for heating, cooling, refrigeration, load calculations, codes, and safety.
ICC Certifications
ICC certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for building inspection, plans examination, electrical systems, mechanical systems, plumbing, energy conservation, and fire safety.
IMSA Traffic Signal Technician
IMSA Traffic Signal Technician certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for cabinet wiring, controller programming, vehicle detection, signal timing, communications systems, and MUTCD standards.
ISA Arborist Certifications
ISA (International Society of Arboriculture) certification exam prep with practice questions, flashcards, and study guides covering the Board Certified Master Arborist, Utility and Municipal Specialist, Aerial Lift Specialist, and Tree Risk Assessment Qualification — tree biology, soil and site assessment, pruning, risk assessment, integrated vegetation management, and urban forestry.
ISA Automation Certifications (CCST & CAP)
ISA CCST Control Systems Technician certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for process measurement, instrumentation calibration, control loops, process control, documentation, and troubleshooting.
ITC Thermography Certifications
ITC Infrared Thermographer certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for thermography principles, thermal imaging equipment, emissivity, heat transfer, inspection applications, and image interpretation.
LEED Credentials
LEED credential exam prep with trade and licensing guides, practice questions, flashcards, and coverage for sustainable site design, energy efficiency, water use reduction, indoor environmental quality, materials, and green building operations.
NABCEP Certifications
NABCEP solar and energy storage certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for PV system design, installation safety, commissioning, energy storage, system inspection, and technical sales.
NATE HVAC Certifications
NATE (North American Technician Excellence) HVAC certification exam prep with practice questions, flashcards, and study guides covering the Core exam and installation and service specialties — air conditioning, heat pumps, gas and oil heating, air distribution, hydronics, light commercial and commercial refrigeration, plus low-GWP refrigerants, ground source heat pumps, and senior efficiency analysis.
NCCCO Crane Operator Certifications
NCCCO Crane Operator certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for load charts, rigging fundamentals, crane inspection, signal communication, safety regulations, and operational controls.
NCCER Certifications
NCCER trade certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for core curriculum, tools and safety, rigging and material handling, blueprint reading, mechanical systems, and trade-specific skills.
New Zealand Trade Registration Exams
New Zealand trade registration exam prep with practice questions, flashcards, and study guides covering the PGDB certifying plumber, gasfitter, and drainlayer examinations and the EWRB electrical registration theory exam — NZ Building Code, AS/NZS 3500 and 5601, the Wiring Rules, and national safety regulations.
NICET Certifications
NICET certification exam prep with trade and licensing guides, practice questions, flashcards, and coverage for fire alarm systems, water-based suppression, construction inspection, materials testing, special hazards, and system layout.
Pesticide Applicator
Pesticide applicator exam prep with state licensing guides, practice questions, flashcards, and coverage for labels, safety, application methods, pests, environmental protection, and regulations.
Plumber License
Plumber licensing exam prep with state and trade guides, practice questions, flashcards, and coverage for plumbing code, drainage, venting, water supply, fuel gas, and safety.
Pool & Aquatic Facility Operator Certifications
Pool and aquatic facility operator certification prep with practice questions and coverage for water chemistry, filtration and circulation, chemical safety, and facility management for the PHTA CPO and NRPA AFO exams.
Refrigerant Certifications (EPA 608, 609 & R-410A)
EPA Section 608 refrigerant certification exam prep with practice questions, flashcards, and study guides covering the Core, Type I small appliance, Type II high-pressure, Type III low-pressure, and Universal certification levels — the Clean Air Act and ozone regulations, refrigerant recovery, recycling and reclamation, leak detection, evacuation, and safe handling.
RETA Refrigeration Operator Certifications
RETA industrial refrigeration certification prep with practice questions and coverage for ammonia refrigeration fundamentals, compressors, condensers and evaporators, system operation, and safety for the CARO and CIRO exams.
Roofing Contractor License
Roofing Contractor licensing exam prep with trade and licensing guides, practice questions, flashcards, and coverage for roofing systems, materials, flashing, codes, safety regulations, and contractor business law.
Structural Pest Control Licenses
Structural pest control license exam prep with practice questions, flashcards, and study guides covering state structural pest categories — general household and rodent control, termite and wood-destroying organisms, fumigation, and lawn and ornamental — including pest biology and identification, integrated pest management, pesticide safety and labeling, and state structural pest control law.
UK Construction & Electrotechnical Trades
UK construction and electrotechnical trade exam prep with practice questions, flashcards, and study guides covering the CITB site safety schemes (SSSTS, SMSTS), the ECS Health & Safety assessment, and the AM2 applied-knowledge assessment — site management duties, CDM regulations, risk assessment, and electrical safety knowledge.
Water / Wastewater Operator
Water and wastewater operator exam prep with certification guides, practice questions, flashcards, and coverage for treatment processes, distribution, collections, math, safety, and regulations.
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Course PlaylistBrowse all 298 study guides
- AACE Certified Cost Professional (CCP) Study Guide
- AACE Certified Cost Technician (CCT)
- AACE Planning and Scheduling Professional (PSP)
- ABC Wastewater Collection Operator Class I
- ABC Wastewater Treatment Operator Class III
- ABC Water Treatment Operator Class II Certification Study Guide
- ABC/WPI Wastewater Treatment Operator Class I Certification Exam
- ABC/WPI Water Distribution Operator Certification Exam (Grades 1–4)
- ABC/WPI Water Distribution Operator Class I Certification Exam
- ACI Aggregate Testing Technician Level 1
- ACI Concrete Field Testing Technician Grade I Study Guide
- ACI Concrete Strength Testing Technician
- ACS CCN1 Core Domestic Natural Gas Safety Assessment
- Alabama Commercial Pesticide Applicator Certification Study Guide
- Alabama HVAC Contractor License
- Alabama Journeyman Electrician
- Alabama Journeyman Plumber
- Alabama Water/Wastewater Operator Certification Study Guide
- Alaska Journeyman Electrician Study Guide
- AM2 / AM2S Electrical Installation Assessment (Applied Knowledge)
- AMPP CIP Level 1 (Basic Coatings Inspector)
- AMPP CIP Level 2 (Certified Coatings Inspector)
- AMPP CP1 Cathodic Protection Tester Study Guide
- API 1169 Pipeline Construction Inspector
- API 510 Pressure Vessel Inspector
- API 570 Piping Inspector
- API 571 Corrosion and Materials
- API 580 Risk Based Inspection Professional
- API 653 Aboveground Storage Tank Inspector
- Aquatic Facility Operator (AFO) Study Guide
- Arizona General Contractor
- Arizona HVAC Contractor License (ROC R-39R/C-39/CR-39)
- Arizona Pesticide Applicator
- Arizona Roofing Contractor
- Arizona Water/Wastewater Operator
- Arkansas Boiler Operator Licensing Exam
- Arkansas General Contractor
- Arkansas HVAC/R Contractor License
- Arkansas Journeyman Electrician Exam Study Guide (2026)
- Arkansas Pesticide Applicator Certification Exam
- ASNT Industrial Radiography Radiation Safety Personnel (IRRSP)
- ASNT NDT Level II Certification
- ASNT NDT Level III Basic Examination
- ASNT NDT Level III Certification Exam
- ASNT NDT Level III Magnetic Particle Testing (MT)
- ASOPE Boiler Operator
- ASSE 5110 Backflow Prevention Assembly Tester Study Guide
- ASSE 6010 Medical Gas Systems Installer
- AWS API 1104 Pipeline Welding Endorsement
- AWS ASME BPVC Section IX + B31.1/B31.3 Endorsement (CWI/SCWI)
- AWS CWEng Certified Welding Engineer
- AWS CWI Certified Welding Inspector
- AWS D1.1 Structural Steel Endorsement
- Backflow Prevention Assembly Tester Study Guide
- BPI Building Science Principles (BSP)
- California C-20 HVAC Contractor License (CSLB)
- California C-39 Roofing Contractor
- California CSLB Class B General Building (General Contractor)
- California Pesticide Applicator Study Guide
- California Structural Pest Control — Branch 2 General Pest Study Guide
- California Structural Pest Control — Branch 3 Wood-Destroying Organisms Study Guide
- California Water/Wastewater Operator
- CCPDT Certified Professional Dog Trainer — Knowledge Assessed (CPDT-KA)
- Certified Construction Manager
- Certified Crop Adviser (International) Exam Study Guide
- Certified Infrared Thermographer Level I
- Certified Infrared Thermographer Level II
- Certified Pool Operator (CPO) Exam
- CITB Site Management Safety Training Scheme (SMSTS)
- City & Guilds 2079 Level 2 Award in F-Gas & ODS Regulations (Category I)
- City & Guilds 2365 Level 2 Diploma in Electrical Installations
- City & Guilds 2391-51 Periodic Inspection & Testing of Electrical Installations
- City & Guilds 2391-52 Combined Inspection & Testing of Electrical Installations
- City & Guilds 2922-34 Level 3 Award in the Installation and Maintenance of Small Solar Photovoltaic Systems
- Colorado Journeyman Electrician Study Guide
- Colorado Journeyworker Plumber (Journeyman Plumber) Exam Study Guide
- Colorado Pesticide Applicator Certification Exam
- Colorado Water/Wastewater Operator
- Connecticut E-2 Unlimited Journeyman Electrician
- Connecticut Pesticide Applicator
- Dubai Municipality DEQ Electrical Technical Staff Qualification
- EMA Electrician Licence Written Assessment Study Guide (Singapore)
- EPA 608 Technician Certification
- EPA 609 MVAC Technician Certification
- EPA Lead Abatement Supervisor (40 CFR 745 Subpart L)
- EPA Lead Inspector Certification (40 CFR 745 Subpart L)
- EPA Lead Risk Assessor (40 CFR 745 Subpart L)
- EPA Section 608 Type I (Small Appliances) Certification Study Guide
- EPA Section 608 Type II (High-Pressure Systems) Certification Study Guide
- EPA Section 608 Universal Refrigerant Certification
- EUSR National Water Hygiene (Blue Card) Study Guide
- FCC Amateur Radio General License
- FCC Amateur Radio Technician License Study Guide
- FCC General Radiotelephone Operator License (GROL)
- FCC Marine Radio Operator Permit (MROP)
- Florida Certified Roofing Contractor (CCC) Study Guide
- Florida Construction Business and Finance Exam
- Florida General Contractor Study Guide
- Florida HVAC Contractor License (Class A/B)
- Florida Journeyman Plumber
- Florida Pesticide Applicator Certification Study Guide
- Florida Water/Wastewater Operator Study Guide
- Funeral Service Examination (NBE)
- GBCI EDGE Expert Certification Exam Study Guide
- Georgia Commercial Pesticide Applicator Certification Exam
- Georgia General Contractor
- HVAC Excellence Certification Study Guide
- IBEW/NJATC Electrical Apprenticeship Aptitude Test (EIAT)
- ICC Accessibility Inspector / Plans Examiner (21) Study Guide
- ICC B1 Study Guide
- ICC Building Plans Examiner (B3)
- ICC Certified Building Official (CBO)
- ICC Commercial Building Inspector Study Guide
- ICC Commercial Electrical Inspector (E2) Study Guide
- ICC Commercial Mechanical Inspector (M2)
- ICC Commercial Plumbing Inspector (P2)
- ICC Electrical Plans Examiner (E3)
- ICC Fire Inspector I (F1) Study Guide
- ICC Fire Plans Examiner (F3)
- ICC Permit Technician (Exam 14)
- ICC Plumbing Plans Examiner (P3)
- ICC Property Maintenance and Housing Inspector
- ICC Residential Electrical Inspector (E1)
- ICC Residential Energy Inspector/Plans Examiner (Exam 79)
- ICC Residential Mechanical Inspector (M1)
- ICC Residential Plumbing Inspector (P1)
- ICC Soils Special Inspector (EC)
- ICC Structural Steel and Bolting Special Inspector (S1)
- ICC Zoning Inspector (75)
- Idaho Journeyman Electrician
- IICRC Water Damage Restoration Technician (WRT)
- IIW International Welding Inspector — Standard (IWI-S)
- Illinois Pesticide Applicator and Operator General Standards Exam
- Illinois Roofing Contractor Study Guide
- Illinois Water/Wastewater Operator
- IMSA Traffic Signal Field Technician Level II
- IMSA Traffic Signal Senior Field Technician Level III
- IMSA Traffic Signal Technician Level I
- IMSA Work Zone Temporary Traffic Control Technician
- Indiana Commercial Pesticide Applicator Certification
- Indiana Journeyman Plumber
- Iowa Journeyperson Plumber Study Guide
- Iowa Pesticide Applicator
- Irrigation Association Certified Irrigation Technician (CIT)
- ISA Board Certified Master Arborist (BCMA)
- ISA CAP Certified Automation Professional
- ISA CCST Level I Certified Control Systems Technician
- ISA Certified Arborist Study Guide
- JIB ECS Health, Safety & Environmental Assessment
- Journeyman Electrician Study Guide
- Journeyman Plumber
- Kansas Pesticide Applicator Study Guide
- Kentucky Commercial Pesticide Applicator Certification
- Kentucky HVAC Contractor License (Master HVAC)
- Kentucky Journeyman Electrician
- LEED AP Building Design + Construction (BD+C)
- LEED Green Associate Study Guide
- Licensed Pest Control Applicator (EPA Core) Exam
- Louisiana Residential Roofing Contractor
- Maine Commercial Pesticide Applicator
- Maryland General Contractor Exam
- Maryland HVAC Contractor License
- Maryland Journeyman Plumber (Journey Plumber/Gas Fitter) License Exam
- Maryland Stationary Engineer License Exam
- Massachusetts Boiler Operator
- Massachusetts Crane Operator (Hoisting Engineer License) Study Guide
- Massachusetts General Contractor (Construction Supervisor License)
- Massachusetts Journeyman Electrician
- Massachusetts Journeyman Plumber Study Guide
- Massachusetts Pesticide Applicator
- Master Electrician Study Guide
- Michigan Journeyman Electrician Study Guide
- Michigan Journeyman Plumber
- Michigan Mechanical Contractor License (HVAC)
- Michigan Pesticide Applicator
- Michigan Roofing Contractor
- Minnesota Boiler Operator Study Guide 2026
- Minnesota General Contractor
- Minnesota Journeyman Electrician Study Guide
- Minnesota Pesticide Applicator Certification Exam
- Missouri Pesticide Applicator
- Missouri Water and Wastewater Operator Certification Study Guide
- Montana Boiler Operator
- NABCEP Photovoltaic Associate (PVA)
- NABCEP PV Installation Professional (PVIP)
- NASCLA Contractor Study Guide
- NATE Core Knowledge Exam
- NATE HVAC Certification
- NBE Arts — Funeral Service National Board Exam Study Guide
- NCCCO Mobile Crane Operator Certification
- NCCCO Overhead Crane Operator Written Exam Study Guide
- NCCCO Rigger Level I
- NCCCO Rigger Level I Study Guide
- NCCCO Rigger Level II
- NCCCO Tower Crane Operator Written Exam
- NCCER Boilermaker
- NCCER Carpenter (Commercial Carpenter)
- NCCER Commercial Electrician (COMELEC26_01) Study Guide
- NCCER Core Curriculum: Introductory Craft Skills
- NCCER Heavy Equipment Operations Certification
- NCCER Industrial Maintenance Mechanic
- NCCER Millwright Certification
- NCCER Rigger (Basic / Advanced)
- NCCER Scaffolder Certification Study Guide
- NEBB Testing, Adjusting and Balancing Certified Technician (CT)
- Nebraska Journeyman Electrician
- Nebraska Pesticide Applicator
- NETA ETT Level II Certified Assistant Technician
- Nevada General Contractor
- Nevada Pesticide Applicator Certification Exam Study Guide
- New Hampshire Pesticide Applicator
- New Jersey Asbestos Abatement (Worker & Supervisor Permit Exams)
- New Jersey Boiler Operator
- New Jersey Commercial Pesticide Applicator Certification
- New Jersey Water and Wastewater Operator
- New Mexico Pesticide Applicator
- New York Pesticide Applicator
- New York Security or Fire Alarm Installer License Study Guide
- NHIE Study Guide
- NICET Electrical Power Testing
- NICET Fire Alarm Systems Level I
- NICET Fire Alarm Systems Level II
- NICET Fire Alarm Systems Level III
- NICET Fire Alarm Systems Study Guide
- NICET Highway Construction Inspection
- NICET Inspection & Testing of Water-Based Systems
- NICET Inspection and Testing of Water-Based Systems Level I
- NICET Inspection and Testing of Water-Based Systems Level II
- NICET Water-Based Systems Layout
- NICET Water-Based Systems Layout Level I
- North Carolina General Contractor
- North Carolina HVAC Contractor License
- North Carolina Pesticide Applicator
- North Carolina Plumbing Contractor Exam (Class I & Class II)
- North Carolina Water/Wastewater Operator
- North Dakota Pesticide Applicator Certification
- NRPP Radon Measurement Professional (RMP)
- NZ EWRB Electrician Registration (Regulations) Examination
- NZ PGDB Certifying Drainlayer Registration Examination
- Ohio Commercial Pesticide Applicator Certification
- Oklahoma Fire Alarm Installer License Study Guide
- Oklahoma Journeyman Electrician
- Oklahoma Pesticide Applicator Certification Study Guide
- Ontario Pesticide Applicator Core Exam (OPT&C)
- Ontario Pesticide Structural Exterminator Module Exam
- Oregon Landscape Contractor License Study Guide (2026)
- Oregon Pesticide Applicator Laws & Safety Study Guide
- Oregon Water and Wastewater Operator Certification
- Pennsylvania Commercial Pesticide Applicator Certification
- Pennsylvania Water and Wastewater Operator Certification Study Guide
- Personal Track Safety (PTS) — Sentinel (Network Rail/NSAR, UK)
- Pesticide Applicator Study Guide
- PRC Registered Master Electrician (RME) Licensure Examination (Philippines)
- Queensland Electrical Licence Capstone Assessment
- R-410A Refrigerant Certification Study Guide
- Red Seal Automotive Service Technician (Interprovincial Exam)
- Red Seal Cook (Interprovincial Standards Examination)
- Red Seal Heavy Duty Equipment Technician (Interprovincial Exam)
- Red Seal Industrial Electrician (Interprovincial Exam)
- Red Seal Industrial Mechanic (Millwright) Study Guide
- Red Seal Parts Technician (Interprovincial Exam)
- Red Seal Truck and Transport Mechanic (310T)
- Restricted Operator Certificate with Aeronautical Qualification (ROC-A)
- RETA Certified Assistant Refrigeration Operator
- RETA CIRO Certified Industrial Refrigeration Operator
- Rhode Island Pesticide Applicator
- South Carolina General Contractor
- South Carolina Pesticide Applicator
- South Carolina Water/Wastewater Operator Study Guide
- Tennessee Contractor Business and Law Examination
- Tennessee General Contractor
- Tennessee Limited Licensed Electrician (LLE) Study Guide
- Tennessee Pesticide Applicator Certification Exam Study Guide
- Texas Air Conditioning and Refrigeration Contractor License Exam
- Texas Fire Alarm Installer License
- Texas Journeyman Electrician License Exam
- Texas Journeyman Plumber
- Texas Pesticide Applicator Certification Study Guide
- Texas Water/Wastewater Operator Certification Exam
- TSSA Gas Technician 3 (G3)
- Utah General Contractor
- Utah Pesticide Applicator
- Virginia Contractor Business Exam Study Guide
- Virginia Journeyman Electrician
- Virginia Journeyman Plumber
- Virginia Water/Wastewater Operator
- Washington Journeyman Electrician (01 General Journey Level)
- Washington Journeyman Plumber
- Washington Pesticide Applicator Certification Exam Study Guide
- Wastewater Collection System Operator Study Guide
- Wastewater Treatment Plant Operator Certification
- Water Treatment Plant Operator
- WELL Accredited Professional (WELL AP)
- West Virginia General Contractor
- Wisconsin Journeyman Electrician Study Guide
- Wisconsin Journeyman Plumber
- Wisconsin Pesticide Applicator
- WPI Water Treatment Operator Class I Study Guide