OAT Practice Test PDF (Free Printable 2026)

OAT Practice Test PDF – Optometry Admission Test

The Optometry Admission Test (OAT) is a standardized exam administered by the Association of Schools and Colleges of Optometry (ASCO). Every applicant to an accredited optometry program in the United States and Canada must submit OAT scores as part of their application. The exam evaluates the scientific knowledge and quantitative reasoning skills that predict success in the first two years of optometry school. Practicing with realistic, printed questions is one of the most reliable ways to build familiarity with the format, identify knowledge gaps, and improve your pacing before test day. Download the free PDF below to begin your offline preparation.

The OAT consists of five test sections and runs approximately 3 hours and 45 minutes of actual testing time, plus a 15-minute optional tutorial and a 30-minute optional break. The exam is delivered entirely on computer at Prometric testing centers. All five sections are scored on a scale of 200 to 400 in one-point increments, and two composite scores are reported: the Total Science (TS) score, which averages the three science section scores, and the Academic Average (AA), which averages all four scored sections except Surveys of Natural Sciences is split internally. Competitive applicants to most optometry schools target an AA of 320 or higher, though top programs such as UC Berkeley and The Ohio State University typically admit students with averages closer to 340–350.

Because the OAT tests physics — unlike the DAT, which tests perceptual ability instead — pre-optometry students often find the exam more demanding on the quantitative science side than pre-dental students expect. This PDF targets all five sections so you can assess your readiness across the full exam, not just the biology-heavy sections most students find comfortable from their undergraduate coursework.

Surveys of Natural Sciences Section

The Natural Sciences section is the longest on the OAT, with 100 questions answered in 90 minutes. It is divided internally into three subject areas: Biology (40 questions), General Chemistry (30 questions), and Organic Chemistry (30 questions). Together these questions make up the Total Science score.

Biology. Cell biology questions cover the structure and function of organelles (rough vs. smooth ER, Golgi apparatus, lysosomes, mitochondria including the electron transport chain), the cell cycle (G1, S, G2, M phases; checkpoints; cyclin-CDK regulation), and cell division including both mitosis and meiosis. Genetics questions test Mendelian inheritance patterns (dominant, recessive, co-dominant, incomplete dominance, sex-linked), chi-square analysis of genetic crosses, DNA replication (leading vs. lagging strand, Okazaki fragments, polymerase fidelity), transcription, and translation including codon reading and the role of tRNA. Evolution questions focus on natural selection mechanisms, Hardy-Weinberg equilibrium and its conditions, speciation modes (allopatric, sympatric), and major evolutionary transitions. Ecology covers population growth models (logistic vs. exponential), trophic levels, nutrient cycles (nitrogen, carbon), and biome characteristics. Vertebrate anatomy and physiology spans the nervous, endocrine, cardiovascular, respiratory, digestive, and reproductive systems — all at the level of a first-year college biology course.

General Chemistry. Atomic theory questions address electron configuration, periodic trends (electronegativity, ionization energy, atomic radius), and nuclear chemistry (alpha/beta/gamma decay, half-life calculations). Chemical bonding covers ionic vs. covalent bonds, VSEPR theory for molecular geometry, hybridization (sp, sp², sp³), and intermolecular forces (London dispersion, dipole-dipole, hydrogen bonding). Reaction stoichiometry — limiting reagent, percent yield, empirical and molecular formula determination — appears in almost every OAT administration. Thermochemistry questions use Hess's Law, standard enthalpy of formation, bond energy calculations, and the first and second laws of thermodynamics including entropy concepts. Equilibrium questions require applying Le Chatelier's principle, writing equilibrium expressions (K_eq, K_a, K_b, K_sp), and calculating equilibrium concentrations using ICE tables. Acid-base chemistry covers Brønsted-Lowry and Lewis definitions, pH/pOH calculations, buffer composition and the Henderson-Hasselbalch equation, and titration curve interpretation. Electrochemistry questions address galvanic cells, cell potential calculation from standard reduction potentials, and electrolysis with Faraday's law.

Organic Chemistry. Nomenclature questions use IUPAC rules for naming alkanes, alkenes, alkynes, and compounds with functional groups including alcohols, aldehydes, ketones, carboxylic acids, esters, amines, and amides. Reaction mechanism questions are the highest-yield area: S_N1 vs. S_N2 (substrate class, solvent polarity, nucleophile strength, stereochemical outcomes); E1 vs. E2 elimination; electrophilic addition to alkenes (Markovnikov's rule, anti-Markovnikov via hydroboration); carbonyl chemistry (nucleophilic addition, aldol condensation, ester hydrolysis). Functional group identification and interconversion is tested both forward (given a reaction, name the product) and backward (given a target molecule, propose a synthesis route). Stereochemistry questions distinguish enantiomers from diastereomers, assign R/S configuration using Cahn-Ingold-Prelog rules, and predict optical activity. Lab technique questions cover extraction, distillation, recrystallization, chromatography (TLC, column, GC), and spectroscopy (IR peak interpretation, ¹H NMR splitting patterns).

Reading Comprehension Section

The Reading Comprehension section presents three scientific passages, each followed by approximately 13–14 questions, for a total of 40 questions in 50 minutes. Passages are drawn from science topics — biology and health science topics are most common — at the level of peer-reviewed journal articles or science magazine features. Questions fall into three categories: main idea and purpose (what is the author's central argument or the passage's primary focus), detail and recall (a specific fact or figure stated in the passage), and inference and application (drawing a conclusion not explicitly stated, or applying the passage's logic to a new scenario). The time pressure is significant: approximately 16–17 minutes per passage including questions, which requires efficient active reading. A common strategy is to read the questions first, then search the passage for the relevant information — the OAT rewards targeted reading over comprehensive memorization of each passage.

Physics Section

The Physics section has 40 questions answered in 50 minutes. Pre-optometry students who did not take calculus-based physics often find this section the most challenging, because many questions require quantitative problem-solving rather than conceptual recognition. Units and dimensional analysis — converting between SI units, recognizing when a calculation is physically reasonable — are foundational skills for the entire section. Kinematics questions cover one-dimensional motion (v = v₀ + at, x = v₀t + ½at²) and projectile motion. Newton's laws questions address free-body diagrams, friction (static vs. kinetic), tension, and circular motion. Work, energy, and power questions use the work-energy theorem and conservation of energy across multiple steps. Waves and optics is the most optometry-relevant area and typically receives the heaviest question weighting: wave characteristics (frequency, wavelength, wave speed), the law of reflection, Snell's law of refraction (n₁sin θ₁ = n₂sin θ₂), the thin lens equation (1/f = 1/d_o + 1/d_i), mirror equations, and the relationship between focal length and the diopter power of a lens are all high-frequency topics. Electricity questions cover Ohm's law, series and parallel circuit analysis, capacitance, and Coulomb's law.

Quantitative Reasoning Section

The Quantitative Reasoning section has 40 questions answered in 45 minutes. Algebra questions address solving linear and quadratic equations, systems of equations, and word problems. Fractions, decimals, and percentages appear in computation questions and in applied contexts such as concentration calculations. Geometry covers area and perimeter of standard shapes, the Pythagorean theorem, similar triangles, and solid geometry (volume and surface area of common solids). Trigonometry questions test the six trig functions, the unit circle, and the law of sines and cosines. Probability and statistics questions use combinations and permutations, basic probability rules (addition and multiplication), mean, median, mode, and standard deviation. Applied math questions — rate, distance, and time problems; mixture problems; work problems — require translating a word problem into equations and solving efficiently. A basic scientific calculator is provided on-screen; no physical calculator is permitted.

OAT vs. DAT: Key Differences to Know

Many pre-health students consider both optometry and dentistry, and comparing the OAT and the DAT helps clarify the test demands of each path. Both exams are administered by Prometric and are computer-based. The most significant structural difference is that the OAT includes a Physics section while the DAT does not — and the DAT includes a Perceptual Ability Test (PAT) assessing spatial reasoning that the OAT does not. Pre-optometry students who are strong in quantitative sciences and less focused on spatial visualization may find the OAT a better fit for their strengths. The Natural Sciences content overlaps significantly — both exams test Biology, General Chemistry, and Organic Chemistry at roughly equivalent depth — so students who have prepared for one exam can convert a portion of their study time toward the exam they are actually taking.

OAT scores are reported to optometry schools through the ASCO OAT program, and all 23 accredited optometry schools in the United States accept OAT scores. Canadian schools use the OAT as well. Score reports are sent automatically to the schools you designate at registration, and additional score reports can be sent to up to five schools for no extra charge. The exam can be retaken 90 days after the most recent attempt, and schools receive all scores from the past five years — a retake policy that rewards preparation over repeated attempts, since all attempts are visible. Most schools consider your highest AA when evaluating your file, but some holistic reviewers note patterns across attempts.

For comprehensive section-by-section oat exam practice, visit the main OAT page where full-length practice tests are organized by subject area.

Preparation Resources and Strategy

The three most widely used commercial OAT preparation resources are Kaplan OAT Prep Plus, OAT Achiever, and Chad's Videos (now part of the Orgoman ecosystem). Kaplan provides structured content review with integrated practice questions and two full-length practice tests. OAT Achiever is known for its physics and quantitative reasoning modules and provides a large question bank that many students find harder than the actual exam — which is intentional, since overpreparation translates to confidence on test day. Chad's Videos delivers concise 5–15 minute tutorial videos covering every testable concept in General Chemistry and Organic Chemistry; many students use these in combination with a question bank rather than as a standalone prep course.

A realistic preparation timeline for a strong student starting from scratch is 3–4 months of focused daily study. Students who completed their science prerequisites recently and maintained strong grades may need only 6–8 weeks of targeted review. The highest-yield strategy is to take a full-length diagnostic test first, identify your two or three weakest sections, and front-load your study time on those areas. Many students over-invest in Biology, where they already have baseline strength, while underinvesting in Physics and Organic Chemistry mechanisms. An honest diagnostic assessment prevents that common imbalance.

Understanding Your OAT Score Report

When you complete the OAT, your unofficial scores appear on-screen immediately. Your official score report is available in your ASCO OAT account within one to two business days and is automatically sent to the optometry schools you designated during registration. The report shows your scaled score (200–400) for each section, your Total Science (TS) score, and your Academic Average (AA). Percentile ranks are also shown, comparing your performance to all OAT test-takers in the preceding 12 months.

The AA is calculated as the average of the Reading Comprehension, Physics, Quantitative Reasoning, and Survey of Natural Sciences section scores. Note that the Surveys of Natural Sciences section is treated as a single section for AA purposes even though it contains three subsections internally. Your TS score is the average of the three science subsections (Biology, General Chemistry, Organic Chemistry) only. Optometry schools typically report the average AA of their entering class in their admissions data; a school reporting an average AA of 330 means that competitive applicants in that cycle were generally scoring in that range, though outliers in GPA, research experience, and letters of recommendation can offset a lower score.

Score validity is five years from the test date. If you apply to optometry school more than five years after your most recent OAT attempt, you must retake the exam. Most students complete the OAT in the spring of their junior year to have scores ready for applications submitted in early summer through the Optometry Centralized Application Service (OptomCAS). Taking the exam in March or April allows time for a retake in June or July if needed, while still meeting early application submission deadlines that tend to favor candidates who apply in the first wave.

Preparing rigorously — working through representative practice questions like those in this PDF, followed by full question-bank review and timed full-length tests — gives you the best foundation for submitting a competitive OAT score with your OptomCAS application.