Here is the answer most "TEAS vs HESI" articles bury: you usually do not get to choose. Each nursing program requires a specific entrance exam, so your first move is not comparing tests — it is opening the admissions page of every program you are applying to and writing down which exam each one wants, which sections, and what minimum scores. Everything else in this article is for the moment after you have done that.
The short version: the ATI TEAS 7 is a fixed, strictly timed exam — 4 sections, 170 questions, 209 minutes — while the HESI A2 is a modular Elsevier exam whose sections, timing, and cutoffs are configured by each school.
That structural difference drives almost everything else about how the two exams feel and how you should prepare. Let's compare them properly.
TEAS vs HESI A2: side-by-side comparison
| ATI TEAS 7 | HESI A2 | |
|---|---|---|
| Made by | ATI Nursing Education | Elsevier (Health Education Systems, Inc.) |
| Structure | Fixed: same 4 sections for everyone | Modular: 8 academic subtests; each program picks (usually 4–6) |
| Sections | Reading, Math, Science, English & Language Usage | Reading, Vocabulary, Grammar, Math, Biology, Chemistry, Anatomy & Physiology, Physics |
| Questions | 170 total (150 scored + 20 unscored pretest items) | Varies by configuration; commonly 55 per English/math section, ~25–30 per science section |
| Timing | 209 minutes, strictly timed per section (Reading 55, Math 57, Science 60, English 37), 10-minute break after Math | Set by the school; total sittings commonly run 4–5 hours |
| Scoring | Composite "Adjusted Individual Total Score" (0–100%) plus section scores, on an equated scale | Percentage score (0–100%) per section plus composite; no equating across configurations |
| Passing score | None from ATI — each program sets its own | None from Elsevier — each program sets its own (many want roughly 75%+ per section; verify yours) |
| Retakes | Set by school/site; waiting periods and attempt caps per cycle are common — verify your program's policy | Set by school; waiting periods between attempts are common (e.g., 60 days at some colleges) |
| Calculator | On-screen calculator provided | On-screen calculator provided for math |
Sources: ATI's official TEAS exam details and help center, Elsevier's HESI FAQ, and college testing-center policies (see the sources list below). Exam fees vary by school and testing site, so check the registration page where you would actually test.
What are the real differences between the TEAS and the HESI A2?
Beyond the table, four differences actually change your experience as a test-taker.
1. Fixed vs modular structure
Every TEAS taker in the country sits the same four sections. On the HESI A2, your school picks your sections — so "how do I study for the HESI" has no universal answer, while "how do I study for the TEAS" does. If you are a HESI candidate, your program's section list is your syllabus.
2. Timing pressure
The TEAS is strictly timed section by section, and its Math section (38 questions in 57 minutes) and Science section (50 questions in 60 minutes) create genuine pace pressure — just over a minute per science question. HESI A2 timing is school-configured and generally more generous overall, so pacing panic is less common. If timed tests rattle you, the TEAS demands specific timed-practice preparation, not just content review.
3. How science is packaged
The TEAS folds anatomy & physiology, biology, chemistry, and scientific reasoning into one integrated Science section — with A&P as the largest slice. The HESI A2 splits sciences into separate subtests with separate scores, which means a program can require a standalone A&P score. Practical upshot: on the HESI you cannot hide a weak science behind strong reading; on the TEAS, one strong area within Science can partially cushion a weaker one.
4. Scoring and how programs use it
TEAS scores are equated, so scores are comparable across test dates and versions, and programs often publish composite cutoffs. HESI A2 results are straight percentages per section, and programs commonly set per-section minimums — many in the neighborhood of 75%, though this varies enough that "check your program" is the only honest rule.
5. Question formats
The HESI A2 is a traditional multiple-choice exam. The ATI TEAS 7, per ATI's official overview, mixes alternate item types in alongside standard multiple choice — multiple-select ("select all that apply"), fill-in-the-blank, ordering, and hot-spot questions where you click a region of an image. None of these are difficult once you have seen them, but meeting a select-all-that-apply item for the first time on exam day is an avoidable jolt. It is also a preview of things to come: the NCLEX uses similar alternate formats, so TEAS-style practice is not wasted effort.
What if my schools require different exams?
If one target program wants the TEAS and another wants the HESI A2, plan to take both — but stagger them rather than prepping simultaneously. The overlap between the exams (more on that below) means your second exam requires far less new studying than your first: sequence the exam for your earliest deadline first, then layer on the second exam's differences.
A sane approach:
- List every program's exam, required sections, minimum scores, and application deadline.
- Prep fully for the exam with the earliest deadline. Build your base of A&P, math, reading, and grammar there.
- Then bridge to the second exam — mostly format familiarity, timing practice, and any sections unique to it (for example, HESI Vocabulary as its own scored section, or TEAS pacing drills).
- Mind the retake clocks. Both exams commonly carry mandatory waiting periods between attempts at the school level, so a disappointing score close to a deadline is hard to fix. Take your first attempt with enough runway for one retake.
How much does TEAS and HESI A2 prep overlap?
More than the two exams' reputations suggest — the core academic skills are close to identical, and that is the most useful insight in this whole comparison. Concretely:
- Anatomy & physiology is the heart of TEAS Science and the hardest-rated HESI subtest. Body systems knowledge transfers one-for-one.
- Math on both exams centers on fractions, percentages, ratios, proportions, and unit conversions — the dosage-calculation skill set — with an on-screen calculator on both.
- Reading comprehension is tested nearly identically: passages, main ideas, inference, detail questions.
- English mechanics overlap heavily: TEAS English & Language Usage and HESI Grammar cover much of the same ground.
What does not transfer: HESI Vocabulary is a dedicated scored section with a medical-terminology bent (worth targeted study on its own), HESI Chemistry/Physics only matter if your program requires them, and TEAS timing pressure needs its own practice. This overlap is exactly why College Resume preps both exams — a diagnostic tells you which shared skills are weak once, and that work pays off on whichever exam your programs require.
Which is harder, the TEAS or the HESI A2?
Neither is uniformly harder — the honest answer is that difficulty depends on your science background and how your program configures the HESI. Students with strong A&P coursework often find the HESI A2 straightforward and the TEAS's pacing the bigger challenge; students who struggle under time pressure often prefer the HESI's typically roomier timing but fear its standalone A&P subtest, where there is nowhere to hide.
A fair summary of the trade-offs:
- The HESI A2 can cover more territory — up to eight separately scored subtests versus the TEAS's four sections — so a science-heavy HESI configuration is a heavier lift than the TEAS.
- The TEAS applies more time pressure per question in Science and Math than most HESI administrations.
- Both are entirely learnable. These are content-driven exams over first-year academic material, not aptitude tests. Preparation moves scores on both — which is precisely why programs use them.
And remember the framing that matters: "which is harder" is mostly academic, because your program has already chosen for you. The real question is "how do I get the score my program wants on the exam it requires."
What if my program accepts either exam?
A minority of programs accept either exam — and only then does "TEAS vs HESI" become a genuine choice. If that is your situation, decide based on your own profile rather than internet consensus:
- Strong sciences and confident in A&P: the HESI A2's modular structure lets a great anatomy & physiology performance stand out as its own score, rather than being averaged into a combined science section.
- Shaky under a clock: the HESI A2's typically more generous, school-set timing may suit you better; if pacing does not rattle you, the TEAS's fixed structure is predictable and straightforward to train for.
- Test logistics: compare available dates, locations, remote-proctoring options, and fees at the sites where you would actually test — these are set locally and can differ more than the exams themselves do.
- Existing prep: if you have already been studying for one exam for another application, the overlap means your fastest path is almost always finishing what you started.
Whichever you choose, confirm in writing that the program accepts that exam for your specific application cycle — testing policies change from year to year, and an admissions email now beats a technicality later.
Decision checklist: what to do this week
- List your target programs and find each one's testing requirement page.
- Record the exam, required sections, minimum scores, retake policy, and deadline for each program.
- If all programs use one exam, your decision is made — start prepping for that one.
- If programs split between exams, schedule the earliest-deadline exam first and plan a bridge period for the second.
- Take a diagnostic before studying. Your prep plan should come from your actual gaps, not a generic study guide's table of contents.
- Book your test date with retake room — leave enough time before your deadline for one more attempt after any waiting period.
Whichever exam your path runs through, the playbook is the same: verify your program's exact requirements, diagnose your gaps, train weakest-first, and simulate the real thing before test day. Choose your programs first — the exam chooses itself.