Ace the OAR test.
Ten minutes a day.
The study app built only for the Navy Officer Aptitude Rating.
2,604practice questions
90question mock exams
IncludesAI tutor
- 2,604 practice questions
- 90-question mock exams
- AI tutor on every answer
Everything you need for a top score
One app, built for one test. Practice, review and rehearse test day — all from your phone.
AI tutor
Tap “Ask” on any question for an instant explanation of why the right answer is right — and why the others are wrong. Follow up until it clicks.
Full-length mock exams
90 timed questions across math, reading and mechanical comprehension, scored by section so you know exactly where the points went.
Past-errors quiz
ProEvery question you miss is queued for review and cleared only when you answer it correctly. Weak spots shrink on their own.
Daily quiz & streaks
A short quiz every day keeps the habit alive. Ten focused minutes beat a weekend of cramming.
89 key-term flashcards
The formulas and words you must know cold, from the Pythagorean theorem to mechanical advantage. Save the hard ones for later.
Performance by section
Accuracy trends and a 70% target for every section, so you spend time on what moves your score.
How it works
Set your test date
Tell OAR Prep when you test. Your home screen counts down the days, so every session has a deadline.
Practice by section
Short quizzes drawn from 2,604 exam-style questions in math, reading and mechanical comprehension, each with a written explanation.
Ask why
Stuck? The AI tutor explains the reasoning. Anything you miss goes into your past-errors review automatically.
Sit a mock exam
Rehearse test day with a timed, 90-question mock exam and check your score by section before the real thing.
What is the OAR test?
The aptitude test behind Navy Officer Candidate School.
The Officer Aptitude Rating (OAR) is the general aptitude part of the Navy’s Aviation Selection Test Battery (ASTB-E). It measures math, reading and mechanical reasoning, and selection boards use the score to predict how you will do in the classroom at Officer Candidate School. Candidates are typically college students and graduates applying for a commission.
- Score
- Officer Aptitude Rating (OAR), on a 20–80 scale
- Part of
- The Aviation Selection Test Battery (ASTB-E); the OAR is three of its subtests
- Subtests
- Math Skills, Reading Comprehension and Mechanical Comprehension
- Format
- Computer-adaptive multiple choice, at an approved proctored test site; no calculator
- Used for
- Navy Officer Candidate School (OCS) and other non-aviation officer programs
- Retakes
- 3 lifetime attempts, at least 30 full days apart; your newest score replaces the old one
Source: Naval Aerospace Medical Institute. Policies change — confirm with your recruiter or on the official ASTB-E FAQ.
2,604 questions.
Sorted by OAR section.
Practice one section or mix them all. Every question has a difficulty rating and a written explanation.
1,134questions
MST
Math Skills
Math Skills Test
Arithmetic, fractions, percentages, ratios, algebra, geometry and word problems, all without a calculator.
734questions
RCT
Reading & Verbal
Reading Comprehension Test
Word knowledge, synonyms, analogies, sentence completion and reading comprehension passages.
736questions
MCT
Mechanical
Mechanical Comprehension Test
Levers, pulleys, gears, forces, motion, pressure, energy and simple circuits.
Ten minutes a day.
Test-ready in weeks.
Reading a review book isn't the same as answering questions against the clock. OAR Prep turns every spare ten minutes into exam-style practice with instant feedback.
Your first quiz is on us.
From the blog
Study plans and strategy for the OAR.
Exam guide · October 24, 2026 · 7 min read
What Is a Good OAR Score? Ranges and Minimums by Program
There is no OAR passing score. See the 20–80 scale, what counts as competitive, and the minimum OAR score for SWO, Intel, Supply and other Navy programs.
Read articleFrequently asked questions
What is the OAR test?
The Officer Aptitude Rating (OAR) is an aptitude test for people applying to become officers in the U.S. Navy. It is made of three subtests of the Aviation Selection Test Battery (ASTB-E): Math Skills, Reading Comprehension and Mechanical Comprehension. Navy Officer Candidate School and other officer programs use the score to select candidates.
How is the OAR scored?
The OAR is reported on a scale from 20 to 80. There is no single passing score: each officer program sets its own minimum, and selection boards compare your score with other applicants. Your recruiter can tell you the target for the program you are applying to.
What is OAR Prep?
OAR Prep is an iPhone and iPad app built only for the OAR. It includes 2,604 exam-style practice questions in math, reading and mechanical comprehension, timed 90-question mock exams, 89 key-term flashcards, a daily quiz and an AI tutor that explains the reasoning behind every answer.
How long should I study for the OAR?
A common plan is 4 to 8 weeks of steady preparation, longer if math or physics is rusty. You only get three attempts in your lifetime, so it pays to prepare before the first one. OAR Prep is designed around short daily quizzes, a past-errors review, flashcards and a countdown to your test date.
Is OAR Prep free?
OAR Prep is free to download on the App Store, and your first quiz is free. OAR Prep Pro, an in-app purchase, unlocks unlimited quizzes, practice by section, full-length mock exams, the past-errors review and extended AI tutor access.
Is OAR Prep affiliated with the U.S. Navy?
No. OAR Prep is an independent study tool and is not affiliated with, sponsored or endorsed by the U.S. Navy, the Department of Defense or the Naval Aerospace Medical Institute. Our questions are original practice questions, not real test items.
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