TEAS vs HESI A2: Which Nursing Entrance Exam Is Harder?

Neither the TEAS nor the HESI A2 is objectively harder — the harder exam is the one that tests what you are weakest at. The two exams reward different strengths. The TEAS packs four sections into 170 questions and 209 minutes, so it punishes slow readers and rewards broad, general academic knowledge. The HESI A2 has more sections, goes deeper on science — especially anatomy and physiology — and runs longer, so it punishes weak A&P and thin stamina. Here is the catch: you rarely get to pick. Most programs require one specific exam, so the real question is not "which is easier" but "how do I prepare for the one my program wants." This guide compares them section by section so you know exactly where you will struggle.

The quick answer: breadth vs. depth

The cleanest way to think about it: the TEAS tests breadth, the HESI A2 tests depth. The TEAS is a fixed, four-section exam that asks for solid general knowledge across reading, math, science, and English under real time pressure. The HESI A2 is modular — schools choose which sections you sit — and the science questions go further into detail, especially in anatomy and physiology. Here is the high-level comparison:

The TEAS numbers above come straight from ATI's official TEAS exam details. The HESI A2 has no single fixed length because — per Elsevier/Evolve — each nursing program decides which modules to administer, so two applicants can sit very different HESI exams.

What's on the TEAS 7

The TEAS is the same for every test-taker: four sections, 170 questions, 209 minutes — about 74 seconds per question. ATI includes a handful of unscored pretest questions in each section that look identical to the scored ones. Here is the official breakdown:

Reading and Science are the heaviest sections, and within Science, anatomy and physiology is the single largest content area. If you want the full A&P-first strategy, our TEAS science breakdown walks through the body systems ATI actually tests.

What's on the HESI A2

The HESI A2 (Admission Assessment) is modular. Elsevier offers a pool of content areas and each nursing program chooses which ones you sit, so there is no universal question count or time limit — it depends entirely on your school. The pool covers an English group (Reading Comprehension, Vocabulary & General Knowledge, Grammar), Math, and a Science group (Anatomy & Physiology, Biology, Chemistry), plus an optional Physics module. Among the academic modules whose length Elsevier publishes, Grammar is 50 questions in 50 minutes, and Anatomy & Physiology and Biology are each about 25 questions. The other academic sections fall in a similar per-section range; confirm the exact counts with your program, since they set the lineup.

The HESI A2 also includes two non-academic modules that some schools require: a Learning Style assessment and a Personality Profile. These are not pass/fail — they help programs understand how you study and work — but they add time to your testing day. The practical upshot: before you build a study plan, get your program to tell you exactly which HESI sections you are taking. Studying chemistry hard for an exam that does not include it is wasted effort. For a deeper look, see our guide to what the HESI A2 exam is.

Section by section: where each exam bites

Same subjects, different pain points. Here is how the overlapping areas compare.

Math: conceptual vs. procedural

TEAS math leans conceptual — word problems that make you set up the equation correctly before you solve it, plus a broad range of topics. HESI math is more procedural: dosage-style calculations, metric conversions, and ratio setups that follow predictable patterns once you have drilled the formulas. TEAS math is harder if you freeze on applying concepts to new situations; HESI math is harder if you have not memorized the conversion formulas.

Science: a little of everything vs. deep A&P

This is the biggest split. The TEAS spreads science across A&P, biology, chemistry, and scientific reasoning, so you need general competence everywhere and cannot just lean on one strength. The HESI A2 goes deeper into anatomy and physiology specifically — expect detailed questions about structures, functions, and processes rather than surface recall. TEAS science is harder if your biology and chemistry are rusty; HESI science is harder if you have not studied A&P recently or thoroughly.

Reading & English: speed vs. medical vocabulary

TEAS reading is one of the heaviest sections and is genuinely time-pressured — a lot of passages in 55 minutes. HESI reading covers similar comprehension and inference skills but tends to feel more manageable on the clock. The English side splits too: the TEAS folds vocabulary into reading and a standard grammar section, while the HESI A2 has a dedicated vocabulary module that leans on medical terminology. TEAS reading is harder if you read slowly; HESI is harder if medical vocabulary is new to you.

Time pressure vs. endurance

The TEAS gives you about 74 seconds per question — fine if you trust your first instinct, brutal if you second-guess. The HESI A2 generally allows more time per question, but because schools can stack many modules, your total testing day can run long and demand real stamina. The TEAS punishes slow, indecisive test-takers; the HESI A2 punishes people who lose focus over a long session.

So which one is harder for you?

Stop trying to rank the exams in the abstract and rank them against yourself. The TEAS is likely harder for you if you:

• Read slowly or struggle with comprehension under time pressure.

• Have thin or rusty general science across biology and chemistry.

• Second-guess yourself and run out of time.

The HESI A2 is likely harder for you if you:

• Have not taken anatomy and physiology recently or in depth.

• Are unfamiliar with medical vocabulary.

• Lose focus or make careless errors during long testing sessions.

In most cases you will not choose anyway — your program does. Check your school requirements before you spend a dime on prep, because most BSN and ADN programs require the TEAS while some programs (often those with heavier science prerequisites) require the HESI A2. Either way, the move is the same: take a diagnostic, find your weak section, and study to it.

TEAS vs HESI A2 FAQ

Is the TEAS or the HESI A2 harder?

Neither is universally harder. The TEAS tests breadth under tight timing, so it is harder for slow readers and people with thin general science. The HESI A2 tests depth — especially in anatomy and physiology — and runs longer, so it is harder for students with rusty A&P or weak test-day stamina. The harder exam is the one that lands on your weak spot.

How long is each exam?

The TEAS is fixed at 170 questions in 209 minutes across four sections. The HESI A2 has no single length because schools choose which modules you take — your total time depends on how many sections your program requires, so confirm the lineup with your school.

Do I get to choose which exam to take?

Usually not. Your nursing program specifies which entrance exam it accepts, and most require one specific test. A few programs accept either. Always check your program requirements before you start studying so you prepare for the right exam.

Which exam has harder science?

They are hard in different ways. The TEAS science section is broad — A&P, biology, chemistry, and scientific reasoning in one timed block — so you need range. The HESI A2 goes deeper into anatomy and physiology, with detailed questions about structures and processes. If your A&P is strong, HESI science may feel easier; if your general science is shaky, the TEAS will feel harder.

How should I study if I am taking the HESI A2?

First confirm which sections your program requires, then go deep on anatomy and physiology, drill medical vocabulary, and practice procedural math setups. A full-length practice exam helps you build the stamina the longer test demands. Our HESI A2 practice test guide is a good place to start.

How is this different from comparing the TEAS to the NCLEX?

The TEAS and HESI A2 are both pre-nursing entrance exams that decide whether you get into a program. The NCLEX is the licensing exam you take after nursing school. They sit at opposite ends of your journey. If you are curious how the entrance exam stacks up against the licensing one, see TEAS vs NCLEX: which nursing exam is harder.

The bottom line

TEAS vs HESI A2 is not a fixed difficulty ranking — it is a matchup between the exam and your weak spots. The TEAS tests breadth fast: solid reading, general science, and quick decisions. The HESI A2 tests depth over a longer haul: detailed A&P, medical vocabulary, and stamina. Find out which exam your program requires, take a diagnostic, attack your lowest section, and practice under the clock. Do that for six to eight weeks and either exam becomes passable — because the difficulty was never in the test, it was in the gap between what it asks and what you walked in knowing.