FREE ASTB-E Study Guide 2026: All 7 Subtests, OAR, PFAR & AQR

This free ASTB-E study guide teaches the entire Aviation Selection Test Battery (Enhanced) — the test the Navy, Marine Corps, and Coast Guard use to select officer aviation candidates.^[1] It covers all seven subtests, the Performance Based Measures, and the four rating scores the test produces: the OAR, AQR, PFAR, and FOFAR.

It’s interactive, not a wall of text: each scored subtest has a built-in checkpoint quiz, hover-able glossary terms, worked math and mechanics examples, labeled aerodynamics diagrams, and concept questions — so you learn by doing.

Work through it subtest by subtest, test yourself at each checkpoint, then round out your free ASTB prep with our practice questions and flashcards. Already focused on just the officer-aptitude portion? The OAR is literally the Math, Reading, and Mechanical subtests below — drill them further with our OAR practice test.

ASTB-E Exam Snapshot

The ASTB-E is built from seven subtests that combine into four scores. Only three of them — Math Skills, Reading Comprehension, and Mechanical Comprehension — make up the OAR; the rest, plus the Performance Based Measures, feed the aviation ratings.^[1] This map shows how the pieces fit together:

The four scored subtests below carry the most study leverage. Aviation & Nautical Information is the single most study-able subtest — it is largely knowledge, not aptitude — while the Math and Mechanical subtests reward rebuilding fundamentals. This guide weights its teaching accordingly:

These shares reflect study priority, not official per-subtest weights — the Navy does not publish item counts or scoring formulas.^[5] Spend the most time where you can move the needle: mental math, mechanical fundamentals, and the highly learnable aviation knowledge.

1 · Math Skills Test (MST)

One of the three OAR subtests. The Math Skills Test covers arithmetic, algebra, and some geometry, as both equations and word problems — and no calculator is allowed. The test is about speed and accuracy with the math you already learned in high school, done in your head and on scratch paper.^[1]

Arithmetic & Number Sense

Rebuild fluency with fractions, decimals, percentages, ratios, exponents, and roots. Know the order of operations (PEMDAS), and practice converting among fractions, decimals, and percents quickly. Estimation is a weapon: rounding to rule out answer choices is often faster than computing an exact value.

Algebra & Equations

Expect single-variable equations, simple systems, and inequalities. Isolate the variable step by step, and remember to flip an inequality sign when you multiply or divide by a negative. Translate word problems into an equation first, then solve.

Geometry & Word Problems

Know the workhorse formulas: area of a rectangle $= lw$, triangle $= \tfrac{1}{2}bh$, circle $= \pi r^2$; the Pythagorean theorem $a^2 + b^2 = c^2$; and time-rate-distance $d = rt$. Basic probability — favorable outcomes over total outcomes — shows up too.

2 · Reading Comprehension Test (RCT)

One of the three OAR subtests. The Reading Comprehension Test gives you passages and asks questions you must answer only from the text. The skill is disciplined reading — extracting exactly what the passage states or directly implies, and nothing more.^[1]

Passage-Supported Answers

The correct answer is always the one the passage supports. Read for the main idea and the author’s logic, then find the choice that the text backs — even if another choice sounds plausible or is true in the real world. If you can’t point to the line that supports a choice, it’s probably wrong.

Distractors & Strategy

The classic RCT trap is the true-but-unsupportedanswer: a statement that is accurate in general but isn’t established by this passage. Other traps overstate the passage (“always,” “never”) or twist a detail. Paraphrase the question, predict the answer, then match.

3 · Mechanical Comprehension Test (MCT)

One of the three OAR subtests. The Mechanical Comprehension Test is applied high-school physics: simple machines, fluids and gases, motion and forces, engines, and electricity. You don’t need heavy calculation — you need to understand how mechanical systems behave.^[1]

Simple Machines (Levers, Pulleys, Gears)

Simple machines trade force for distance. A mechanical advantage lets you move a big load with a small effort, at the cost of moving the effort farther. Know the three lever classes by what sits in the middle:

For pulleys, a fixed pulley only changes a force’s direction, while a movable pulley multiplies force. For gears, meshed gears turn in opposite directions, and a smaller gear driven by a larger one spins faster but with less torque.

Fluids, Gases & Pressure

Two big ideas: Bernoulli’s principle(faster fluid flow means lower pressure) and Boyle’s law (at constant temperature, pressure and volume are inversely related — squeeze a gas into less space and its pressure rises). Hydraulics use Pascal’s principle: pressure applied to a confined fluid transmits equally, so a small force on a small piston lifts a large load on a big piston.

Motion, Forces & Engines

Expect questions on weight distribution and balance (where a load sits changes the force needed), basic Newtonian motion (a net force causes acceleration), friction, and the four-stroke engine cycle — intake, compression, power, exhaust. Electricity basics (series vs parallel circuits, what a fuse does) can appear too.

4 · Aviation & Nautical Information Test (ANIT)

The most study-able subtest. The Aviation and Nautical Information Testis largely a test of knowledge — aviation history, aerodynamics, aircraft components, flight rules, airfield operations, navigation, and nautical/carrier terminology. Because it rewards studying, it’s often the fastest place to raise your aviation ratings.^[3]

Aerodynamics & Principles of Flight

Start with the four forces: lift, weight, thrust, and drag. Lift comes from the wings (via Bernoulli’s principle and the downward deflection of air), and rises with angle of attack until the critical angle — beyond which the wing stalls.

Know drag types (parasite vs induced), ground effect near the runway, and the basics of how a helicopter’s rotor generates lift. These are the aerodynamics facts the ANIT loves.

Aircraft Components & Instruments

The three primary flight controls are the ailerons (roll), elevator (pitch), and rudder (yaw). Flaps and slats are secondary high-lift devices. Know the major instruments — altimeter, airspeed indicator, attitude indicator — and the parts of an airframe (fuselage, empennage/tail, vertical and horizontal stabilizers).

Airfield Ops & Navigation

Learn runway numbering (a runway’s number is its magnetic heading divided by 10), basic light-gun signals for lost communications, the difference between magnetic and true north, and Zulu time (UTC). Speeds and distances in aviation use knots and nautical miles.

Nautical & Carrier Knowledge

Naval aviators operate from ships, so the ANIT tests seamanship too: port (left) and starboard (right) facing the bow, ship designations (CV/CVN = aircraft carrier, DDG = destroyer), the catapult and arresting gear that launch and recover aircraft, and the color-coded flight-deck jerseys.

5 · Personality, Performance & Biographical Subtests

Three of the seven subtests aren’t academic and have no “right” answers to study. You can’t cram them, but knowing how they work — and how to approach them honestly — keeps them from hurting your application.^[1]

NATFI — Naval Aviation Trait Facet Inventory

The NATFIis a forced-choice personality inventory: you pick which of two statements better describes you. There are no correct answers, and a built-in consistency check means trying to “look like a pilot” tends to backfire. Answer honestly and consistently — the instrument is designed to detect gaming.

PBM — Performance Based Measures

The Performance Based Measures battery uses a desktop stick-and-throttle (HOTAS) controller and headphones to measure psychomotor skill and multitasking. There is no helmet or head tracker.Tasks build from simple tracking to a high-workload “multitracking” combination and an emergency scenario:

The biggest surprise is the inverted stick — pushing forward moves the cursor down, like real aircraft pitch — and the dichotic listeningtask, where different audio plays in each ear. You can’t practice the actual hardware, but knowing the controls and the task stack in advance reduces test-day shock.

BI-RV — Biographical Inventory

The Biographical Inventory with Response Validationasks about your background, education, and experiences that statistically predict aviation success. The “Response Validation” part flags inconsistent or exaggerated answers — another reason to answer truthfully and consistently throughout the battery.

6 · Your Scores: OAR, AQR, PFAR & FOFAR

The seven subtests combine into four rating scores. Understanding what each one means — and which board uses it — tells you where to focus.^[1]

The OAR (20–80)

The Officer Aptitude Rating is built from only three subtests — Math Skills, Reading Comprehension, and Mechanical Comprehension — and reported on a 20–80 t-score scale, with the average band around 40–60. It measures general officer/academic aptitude, so non-aviation officer programs (and the standalone OAR test) use it on its own.

AQR, PFAR & FOFAR (1–9)

The three aviation ratings are stanines from 1 to 9, where 5 is average and 9 is the top few percent. They combine most subtests with weights the Navy keeps proprietary, so beyond the OAR there is no published formula:

• AQR (Academic Qualifications Rating): predicts ground-school / pre-flight academic success — Math weighs heaviest.
• PFAR (Pilot Flight Aptitude Rating): predicts primary flight success for pilots — aviation knowledge and the PBM weigh heavily.
• FOFAR (Flight Officer Flight Aptitude Rating): the same idea for naval flight officers (NFOs).

Boards review them in pairs: a pilot board looks at your AQR and PFAR; a flight officer board looks at your AQR and FOFAR. Here is how the 1–9 stanine maps to the candidate pool:

How to Use This Study Guide

A study guide is a map, not the whole territory. Because three subtests (NATFI, PBM, BI-RV) can’t be crammed, put your study time where it pays off: the Math, Mechanical, and especially the highly learnable Aviation & Nautical knowledge. With only three lifetime attempts, prepare thoroughly before your first sitting.

ASTB Glossary

Quick definitions for the terms you’ll see most across the ASTB-E:

Aileron

A primary flight control on the trailing edge of each wing that controls roll about the aircraft's longitudinal axis.

Angle of attack

The angle between a wing's chord line and the oncoming air. Lift rises with angle of attack until the critical angle, beyond which the wing stalls.

ANIT

Aviation and Nautical Information Test — aviation history, aircraft components, aerodynamics, flight rules, airfield operations, navigation, and nautical/carrier terminology. The most study-able subtest.

AQR

Academic Qualifications Rating — a 1–9 stanine predicting success in aviation ground school and pre-flight academics. Math Skills weighs most heavily. Note: it is the 'Academic,' not 'Aviation,' qualifications rating.

ASTB-E

The Aviation Selection Test Battery (Enhanced), a computer-administered test used by the Navy, Marine Corps, and Coast Guard to select officer aviation candidates. It has seven subtests and produces four rating scores.

Bernoulli's principle

As a fluid's speed increases, its pressure decreases. Faster air over a wing's curved upper surface lowers the pressure there, contributing to lift.

BI-RV

Biographical Inventory with Response Validation — background and experience questions that predict aviation success, with a built-in check that flags inconsistent or dishonest answering.

Dichotic listening

A PBM task that plays different audio in each ear; you attend to one assigned ear and respond to its content while ignoring the other.

Drag

The aerodynamic resistance opposing an aircraft's motion through the air, opposite to thrust.

Elevator

A primary flight control on the horizontal tail that controls pitch (nose up or down) about the lateral axis.

FOFAR

Flight Officer Flight Aptitude Rating — a 1–9 stanine predicting primary-flight-training success for prospective naval flight officers (NFOs).

Fulcrum

The fixed pivot point of a lever about which the bar rotates.

Gear ratio

The ratio of teeth (or sizes) between meshed gears, setting the trade-off between rotational speed and torque. Meshed gears turn in opposite directions.

HOTAS

Hands-On-Throttle-And-Stick — the desktop stick-and-throttle controller used for the PBM. The stick's pitch axis is inverted, so pushing forward moves the cursor down, like real aircraft pitch.

Lift

The aerodynamic force, generated mainly by the wings, that opposes weight and holds an aircraft up.

MCT

Mechanical Comprehension Test — applied high-school physics: levers, pulleys, gears, hydraulics, gas laws, fluid dynamics, engines, and electricity.

Mechanical advantage

How much a simple machine multiplies input force, equal to output force divided by input force. More force always costs more distance moved.

MST

Math Skills Test — arithmetic, algebra, and some geometry as equations and word problems, with no calculator allowed. One of the three subtests that make up the OAR.

NATFI

Naval Aviation Trait Facet Inventory — a forced-choice personality inventory with no right answers. Respond honestly and consistently rather than trying to game it.

OAR

Officer Aptitude Rating — a 20–80 score built from only the Math Skills, Reading Comprehension, and Mechanical Comprehension subtests. It measures general officer/academic aptitude and is used for non-aviation officer programs too.

PBM

Performance Based Measures battery — psychomotor and multitasking tasks performed on a stick-and-throttle (HOTAS) controller with headphones: tracking, dichotic listening, and an emergency scenario.

PFAR

Pilot Flight Aptitude Rating — a 1–9 stanine predicting success in primary flight training for prospective pilots (student naval aviators). Aviation knowledge and the performance measures weigh heavily.

Port

The left side of a ship or aircraft when facing the bow (front).

Pulley

A grooved wheel for a rope or belt. A fixed pulley only changes a force's direction; a movable pulley provides mechanical advantage.

RCT

Reading Comprehension Test — questions answerable only from the information in the passage; an answer that is true in the real world but unsupported by the text is wrong.

Rudder

A primary flight control on the vertical tail that controls yaw (nose left or right) about the vertical axis.

Stall

The sudden loss of lift when a wing exceeds its critical angle of attack and airflow separates from the surface. It can happen at any airspeed or attitude.

Stanine

A 'standard nine' score from 1 to 9, where 5 is average. The AQR, PFAR, and FOFAR are stanines; a 5 is the 40th–60th percentile and a 9 is the top ~4% of the candidate pool.

Starboard

The right side of a ship or aircraft when facing the bow (front).

Thrust

The forward force produced by the engine or propeller that opposes drag and accelerates the aircraft.

Weight

The downward force of gravity on the aircraft, opposed by lift.

Zulu time

Coordinated Universal Time (UTC / GMT), used in aviation and the military so everyone references one time zone regardless of location.

Free ASTB Study Materials & Resources

Everything you need to prepare for the ASTB-E is free here — no paywall, no sign-up. This guide is the foundation; pair it with the rest of our free ASTB study materials for active recall, timed practice, and last-minute review:

• ASTB Practice Test — exam-style questions across the Math, Reading, Mechanical, and Aviation subtests, with explanations.
• ASTB Flashcards — active-recall decks for aerodynamics, mechanical concepts, math formulas, and nautical terms.
• OAR Practice Test — extra drilling on the three OAR subtests (Math, Reading, Mechanical) that also count toward your ASTB scores.

ASTB Study Guide FAQ

References

1. 1.U.S. Marine Corps. “Marine Corps Aviation — Officer Programs.” U.S. Marine Corps. ↑
2. 2.Naval Education and Training Command. “Naval Aviation Schools Command (NASC).” U.S. Navy. ↑
3. 3.Federal Aviation Administration. “Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25).” Federal Aviation Administration. ↑
4. 4.U.S. Navy. “Navy Officer Candidate School (OCS) — Pilot & Naval Flight Officer.” Navy.com. ↑
5. 5.Secretary of the Navy. “SECNAVINST 1532.1A — Aviation Selection Test Battery policy.” Department of the Navy. ↑
6. 6.U.S. Coast Guard. “Coast Guard Aviation — Officer Accessions.” U.S. Coast Guard. ↑

Sources for the concept answers

Every answer in the ASTB concept questions above is drawn from an official primary source:

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