NEX vs. TEAS vs. HESI A2 Comparison

NEX vs. TEAS vs. HESI A2: Which Exam, and Why It Matters

The single most important rule: your nursing program decides which exam you take. Never pay for an exam before confirming the requirement with admissions, because scores from the wrong test are usually rejected outright. With that fixed, knowing the structural differences helps you study smart and, where a program accepts more than one, pick the format that fits your strengths.

Side-by-side comparison (2026)

Trap: Costs shift by year and testing site, and remote proctoring adds a fee on every exam. Treat the dollar figures above as ballpark, and confirm the current price at checkout for your delivery method.

Content coverage at a glance

The biggest structural contrast is granularity. The NEX bundles all life-science content into one Science section; the HESI A2 breaks it into discrete Anatomy & Physiology, Biology, Chemistry, and Physics sections, and many programs require only a subset (for example, A&P + Math + Reading). The TEAS is unique in two ways: it forbids any calculator, so mental and paper arithmetic speed matters, and it has a full English & Language Usage section testing grammar and punctuation that the NEX largely omits.

Choosing when a program accepts more than one

• Lean NEX if you want the shortest sitting, the lowest fee, and you are comfortable with science but shaky on formal grammar rules.
• Lean TEAS if your arithmetic is fast without a calculator and your language-usage skills are strong.
• Lean HESI A2 if you are broadly strong, do not mind a long exam, and a program only requires a few of its sections — letting you skip your weak areas entirely.

Worked scenario

Maria's program accepts the NEX or the HESI A2 and requires only Reading, Math, and A&P. On the HESI she could sit just those three sections (~2 hours) and skip Chemistry, Biology, and Physics. On the NEX she must complete all three sections including the full Science block, which blends chemistry and biology she finds hard. Here the HESI's modular structure is the better fit — proof that exam choice should follow which sections a program actually scores, not just total length.

Where the studying overlaps

Because core reading, basic math, and A&P recur everywhere, a candidate preparing for two of these exams can reuse most material. The exam-specific add-ons to budget separately are NEX: percentile interpretation; TEAS: no-calculator drills and grammar; HESI A2: physics and a dedicated chemistry section.

How the scoring differences change your strategy

The scoring model is not a trivia point — it changes how you should aim. On the TEAS, a single composite percent is the headline number, so weak performance in one area is diluted by strength elsewhere; you can afford a soft spot if your overall average stays high. On the HESI A2, each section earns its own percent and programs often set a minimum per section (for example, 75% in A&P), so one weak section can sink an otherwise strong profile and you cannot average your way out of it.

The NEX sits between these: it reports section percentiles and a composite percentile, and because admission is competitive rather than pass/fail, raising any percentile improves your relative standing. The practical lesson is to learn your target program's rule before you study — a per-section minimum demands you shore up every weak area, while a composite or percentile model lets you lean into strengths.

Validity, retakes, and logistics differ too

Score validity is set by the program rather than the test maker, but two years is the common ceiling across all three exams; some competitive programs accept only scores from the most recent application cycle. Retake rules also vary by institution: many require a waiting period (often 30 to 90 days) and cap attempts per cycle, and a few average multiple attempts rather than taking the highest. Remote proctoring is available for all three but adds a fee and a system-check burden every time.

When a program accepts more than one exam, factor these logistics in: if you expect to need a fast retake before a deadline, the exam with the shortest mandated wait and easiest scheduling may matter as much as content fit.

Bottom line

The three exams are more alike in content than their marketing suggests — reading, basic math, and anatomy and physiology dominate all of them. The differences that actually decide your experience are calculator policy (none on the TEAS), physics (HESI only), section granularity (HESI is modular, NEX is bundled), and scoring model (percentile, composite percent, or per-section percent). Confirm the requirement, then prepare for the format you will actually sit.