Free OAT practice tests are harder to find than for other exams. The ADA, which runs the OAT, sells its official practice test for $100, or $20 per module, and offers free reference text lists rather than a free full-length test. Most free OAT practice comes from prep company accounts. This guide lists every OAT practice option we could verify for 2026, what the official test includes, when it's worth paying for, and how to use practice tests well. It's for pre-optometry students planning their OAT prep, and it matters because full-length practice is how you build the stamina for a test that runs about five hours. Facts were checked on November 7, 2026.

Quick answer

OAT Practice Tests at a Glance

There's no free official full-length OAT. Use free company accounts and question banks to practice, and buy the official ADA practice test for your final week.

OptionProviderCostWhat you get
Official OAT practice testADA (through Prometric)$100 full test, or $20 per module6 modules, 3 hours 35 minutes, no break
OAT reference textsADAFreeList of the textbooks the OAT draws on
Free accountOAT BootcampFree"Start studying for free"; check what's included at signup
OATBoosterBooster Prep$599 for 90 days (sale; regular $699)No free version

Official

The Official ADA OAT Practice Test

The ADA sells a full OAT practice test for $100, or any single module for $20. The modules are written by OAT test constructors, so they're the best preview of real question style.

ModuleItems
Biology 20140
General Chemistry 20130
Organic Chemistry 20130
Reading Comprehension 20125
Physics 20140
Quantitative Reasoning 20140

The full test runs 3 hours 35 minutes with no break, and you have 24 hours from purchase to finish it. The ADA notes that some modules have fewer items than the real test. Source: the ADA's OAT application page. The ADA also publishes free OAT reference texts so you know which textbooks to review.

Free options

Free OAT Practice From Prep Companies

OAT Bootcamp offers a free account to start studying. Booster Prep has no free OATBooster version, so its practice tests are paid only.

  • OAT Bootcamp: a free account ("Start studying for free"); the site doesn't say what it includes, so check at signup. Read our OAT Bootcamp review.
  • OATBooster: $599 for 90 days or $999 for 180 days (sale prices; regular $699 and $1,299), with no free version. Read our OAT Booster review.

Company practice tests use their own scales, so don't compare scores across companies. See how OAT Booster compares with the ADA practice test.

Verdict

Is the Official OAT Practice Test Worth It?

Yes, for most students. At $100, it's the only practice written by the people who write the OAT. Take it in your final 7–10 days as a readiness check, not as a score prediction. If money is tight, buy only the $20 modules for your weakest sections.

Strategy

How to Use OAT Practice Tests

  1. Start with a diagnostic from a free account or your course.
  2. Drill your weakest sections with your course's question bank.
  3. Take timed full-lengths every week or two in your final six weeks.
  4. Save the ADA test for your last 7–10 days.
  5. Plan your weeks with our 3-month OAT study schedule, and check your targets in what makes a good OAT score.

Ready for a full course? Compare every option in Best OAT Prep Courses.

FAQ

Is there a free official OAT practice test?

No. The ADA's official OAT practice test costs $100 for all six modules, or $20 per module. The ADA's free resources are its OAT Candidate Guide and reference text list. Free practice comes from prep company accounts such as OAT Bootcamp's free sign-up.

How long is the ADA OAT practice test?

The full official practice test runs 3 hours 35 minutes with no break, across six modules: Biology, General Chemistry, Organic Chemistry, Reading Comprehension, Physics and Quantitative Reasoning. You have 24 hours from purchase to complete it, and each single module has the same 24-hour window.

How many OAT practice tests should I take?

Most students take six to ten full-length practice tests over a three-month plan, mostly in the final six weeks. Use your course's tests for regular practice, and save the ADA practice test as a readiness check in your final 7–10 days.

How we reviewed

Sources