12.1 Domain-Weighted Final Review Plan

Build the Final Week Around the Official Blueprint

The final SC-900 review should start from the official skills measured document, which Microsoft last updated effective November 7, 2025. SC-900 measures four skill areas, and the percentage in parentheses is the share of scored questions Microsoft draws from each area:

The weights do not tell you the exact number of questions you will see, but they tell you where Microsoft places emphasis. The largest single domain is Microsoft security solutions at 35-40%, so it earns the most repetition. The smallest is concepts at 10-15%, but those concepts are the language every other question is written in, so they get a short daily refresh rather than a skip.

Allocate by Weight, Then Re-Balance by Misses

Use the weights to set a starting allocation, then let your practice results move time around. If you are already strong in Microsoft Entra but weak in Microsoft Purview, shift hours toward compliance. If you keep confusing Defender product names, add product-selection drills. Do not abandon the small concepts domain: shared responsibility, defense in depth, the Zero Trust model, the CIA triad (confidentiality, integrity, availability), encryption and hashing, GRC, authentication, authorization, identity providers, directory services, Active Directory, and federation are the terms that make the product questions readable.

The security-solutions domain is the broadest. It spans Azure DDoS Protection, Azure Firewall, Web Application Firewall (WAF), network segmentation with virtual networks, network security groups (NSGs), Azure Bastion, Azure Key Vault, Microsoft Defender for Cloud, Cloud Security Posture Management (CSPM), cloud workload protection, Microsoft Sentinel (SIEM/SOAR), and the Microsoft Defender XDR services (Defender for Office 365, Endpoint, Cloud Apps, Identity, Vulnerability Management, and Defender Threat Intelligence). Breadth is the challenge: you need recognition of what each tool is for, not administrator-level implementation steps.

Microsoft Entra is the next-largest block. Focus on authentication methods, MFA, password protection, Conditional Access, Entra roles and RBAC, ID Governance, access reviews, Privileged Identity Management (PIM), and ID Protection. Most misses here come from confusing governance, privileged access, and risk-based protection. Read the verb in the scenario before you choose.

A Practical Three-Pass Final Review

• Pass 1 - Coverage. Revisit every chapter summary and key takeaway so no objective area is untouched. Tick each bullet from the official outline.
• Pass 2 - Scenario sorting. Sort prompts into Entra, Azure-infrastructure, Defender, Sentinel, Purview, or concept-only buckets. Speed of sorting predicts speed on the real exam.
• Pass 3 - Timed recall. Answer under time pressure and say aloud why each wrong option is wrong.
• Final check. Confirm names, the rebrand map, scoring, retake rules, and the exam-environment boundaries.

Compliance review should be concrete. Associate Microsoft Purview with data classification, Content explorer, Activity explorer, sensitivity labels, DLP, records management, retention, insider risk management, eDiscovery, and audit. Associate the Service Trust Portal with Microsoft's compliance, security, and privacy resources; Microsoft Priva with privacy risk and subject rights; and Compliance Manager with the compliance score and improvement actions.

End each session by explaining one scenario from each of the four domains without looking at notes - active recall, not passive rereading, is what moves a fundamentals score.

Translate Weights Into a Concrete Schedule

A weight range is only useful once it becomes hours on a calendar. Suppose you have ten focused hours left before the exam. A defensible split mirrors the blueprint: roughly four hours on Microsoft security solutions (the 35-40% domain), two and a half hours on Microsoft Entra, two hours on Microsoft compliance solutions, one hour on concepts, and a final half-hour on logistics, scoring, and the rebrand map. Then move an hour toward whichever domain your last full-length practice scored worst on.

This keeps you honest: candidates naturally over-study the topics they already enjoy, which is usually identity, and under-study the broad security-solutions domain that actually carries the most questions.

Within the security-solutions block, split your attention three ways so the breadth does not blur together:

1. Azure infrastructure security - DDoS Protection, Firewall, WAF, virtual-network segmentation, NSGs, Bastion, and Key Vault. Know the one-line purpose of each.
2. Security management - Defender for Cloud, CSPM, Secure Score, and cloud workload protection. Tie each to "posture" or "workload protection."
3. SIEM/SOAR and XDR - Microsoft Sentinel versus the Microsoft Defender XDR services. Know which is the cloud-native SIEM and which is the integrated detection/response suite.

Use Practice Diagnostics, Not Feelings

Finish the review week with the free Microsoft practice assessment on Microsoft Learn, which mirrors the objective domains. Treat its per-domain breakdown as your re-balancing signal: a low score on compliance means more Purview time, not more Entra time. Avoid the common trap of measuring readiness by confidence - confidence tracks familiarity, and familiarity is highest in the domains you have already studied most. The blueprint plus a recent diagnostic, not a gut feeling, should decide where the last hours go.

End every session by explaining one scenario per domain aloud, because if you can teach it without notes, you can recognize it under a 45-minute clock.