OAT practice test, OAT practice exam and OAT practice questions for the Optometry Admission Test

The OAT is administered by the ADA Department of Testing Services and recognized by the Association of Schools and Colleges of Optometry. It is computer-based, taken at Prometric test centers, and made up of 230 multiple-choice questions across four sections. The Survey of the Natural Sciences is 100 questions covering Biology (40), General Chemistry (30) and Organic Chemistry (30). Reading Comprehension is 50 questions across three science passages, and no outside knowledge is needed. Physics is 40 questions, and Quantitative Reasoning is 40 questions. Actual testing time is about 4 hours 5 minutes; with the optional 15-minute tutorial, an optional 30-minute break and a 15-minute post-test survey, plan for roughly 5 hours at the center.

• Survey of the Natural Sciences: 100 questions (Bio 40, Gen Chem 30, Org Chem 30)
• Reading Comprehension: 50 questions, three science passages
• Physics: 40 questions, and Quantitative Reasoning: 40 questions
• About 4 hours 5 minutes of testing, roughly 5 hours total

The OAT reports standard scores from 200 to 400 for each section, where 300 is the national mean, at roughly the 50th percentile, with a standard deviation of about 40. Two composite numbers matter most to schools. Your Academic Average is the mean of your six standard scores across Biology, General Chemistry, Organic Chemistry, Physics, Reading Comprehension and Quantitative Reasoning. Total Science is a single standard score built from your combined performance on Biology, General Chemistry, Organic Chemistry and Physics. There is no passing score: each optometry school decides what it considers competitive, and admissions weigh your GPA, experience and the rest of your application alongside the OAT.

• 200 to 400 standard-score scale, 300 is the national mean
• Academic Average is the mean of all six section scores
• Total Science combines Biology, both Chemistries and Physics
• No passing score; each school sets its own expectations

On the 200 to 400 scale, the national average Academic Average is around 300, near the 50th percentile. A score of 320 or higher is a widely cited competitive target, roughly the average AA of admitted students across many programs, and 330 to 340 sits near the 90th percentile and is competitive for the most selective schools. Those percentile mappings come from the OAT normative data; the word competitive is interpretation, because no school publishes a hard cutoff. Matriculant averages have trended up toward the low 310s in recent years, so the practical target is at or above the median score of the schools you are actually applying to, then let the rest of your application carry weight.

• National average Academic Average is about 300 (50th percentile)
• 320 or higher is generally considered competitive
• 330 to 340 (about the 90th percentile) is strong for top programs
• No school publishes a hard cutoff, so target each school's median

If you are choosing between optometry and dentistry, or just cross-reading prep, the single distinction to keep straight is this: the OAT has a Physics section and no Perceptual Ability Test, while the DAT has the Perceptual Ability Test and no Physics. Both exams come from the same ADA testing service and share Biology, General and Organic Chemistry, Reading Comprehension and a quantitative section, so most of your science prep transfers. Neither exam is universally harder. If you are strong in physics, the OAT may suit you; if you excel at spatial reasoning, the DAT's Perceptual Ability Test may feel easier. Note the OAT is scored 200 to 400 while the DAT moved to a 200 to 600 scale on March 1, 2025, so do not compare the raw numbers. The other structural difference is size: the OAT is 230 items over 5 hours 5 minutes, the DAT 280 items over 5 hours 15 minutes, because the Perceptual Ability Test alone is 90 items against the OAT Physics section's 40.

OAT Quantitative Reasoning is 40 items in 45 minutes, and it is the section people most often under-prepare because they assume it is generic pre-med math. The 2026 Candidate Guide lists the content in two buckets. Mathematical Problems covers algebra (equations and expressions, inequalities, exponential notation, absolute value, ratios and proportions, and graphical analysis), then Data Analysis, Interpretation and Sufficiency, then Quantitative Comparison, then Probability and Statistics. Applied Mathematics, meaning word problems, is the second bucket and it is listed separately for a reason: translating a paragraph into an equation under time pressure is a different skill from solving the equation. Two details change how you should practice. First, a basic four-function calculator appears on screen for this section only, so no graphing, no scientific functions, and no memory beyond what the on-screen tool offers, which means messy arithmetic has to be planned around rather than powered through. Second, Quantitative Comparison items ask you to judge the relationship between two quantities rather than compute a single value, and candidates who drill only for a numeric answer lose time on them. At 45 minutes for 40 items you have about 67 seconds each, so the section rewards recognizing a question type fast far more than it rewards depth.

• 40 items in 45 minutes, about 67 seconds per question
• Algebra, data analysis and sufficiency, quantitative comparison, probability and statistics
• Applied Mathematics word problems are listed as a separate content area
• A basic four-function on-screen calculator, available in this section only

This is worth getting straight before you pay for anything, because the search results for OAT sample test and OAT prep test mix three different things together. The OAT Program publishes free practice test questions at oat.ada.org, and they are the only officially sourced OAT items in existence. The Candidate Guide is blunt about what they are for: they exist to show you the types of questions the exam asks, they are explicitly not intended to indicate how you will perform, and it cautions candidates not to limit their preparation to reviewing them. They are also copyrighted, which is why no legitimate site reproduces them. The second thing people find is a downloadable OAT sample test PDF, and no official full-length one exists; a PDF circulating under that name is either the ADA practice questions re-hosted or a third-party set. The third is Prometric Test Drive, which does include a sample test, but the Guide states it is a generic 15-minute test rather than an OAT-specific one, sold to familiarize you with check-in and the testing interface, not the content. One more line from the Guide is worth quoting when you are choosing a course: the OAT Program does not endorse any specific test preparation course and has no data on the content or efficacy of any of them. So an official OAT practice exam in the sense most people mean, a scored full-length predictor from the ADA, does not exist. Every full-length OAT practice test on the market is a third-party approximation, ours included, and the honest way to use one is for pacing and weak-area diagnosis rather than as a score prediction.

• The ADA publishes free practice test questions at oat.ada.org, copyrighted
• They show question types and are explicitly not a performance predictor
• No official full-length OAT sample test PDF exists
• Prometric Test Drive includes a generic 15-minute sample test, not an OAT one
• The OAT Program endorses no prep course and holds no data on their efficacy

The 2026 OAT examination fee is $520, it is non-refundable and non-transferable, and it includes administration plus score reporting to the schools you select at the time of application. Three other fees exist and catch people out: $55 for each score report requested after application, $105 for an optional score audit within 30 days of your appointment, and $150 to extend your eligibility period by 45 days, which you may do once per application. On retakes, the 2026 Candidate Guide sets a 60-day wait between attempts with a maximum of four administrations in any 12-month period, and if you use all four you cannot sit a fifth until 12 months have passed from the first of those four. Three or more attempts require written permission to test again, with proof of a recent application to optometry school, and after a fifth attempt you may retest only once per 12-month period. None of that is subject to appeal. One detail worth planning around: if you have tested more than once, a history of all your testing attempts is reported to the schools, not just your best result. Most students study for about 8 to 12 weeks, built around content review followed by full-length practice and heavy question volume rather than passive re-reading. Because every attempt follows your application, thorough practice before the first sitting is the cheapest path.

• 2026 examination fee $520, non-refundable and non-transferable
• A 60-day wait between attempts, and at most four attempts in any 12 months
• Three or more attempts require written permission and proof of an optometry school application
• Schools see a history of every attempt, so the first sitting matters
• Plan roughly 8 to 12 weeks of question-heavy study