Free ASVAB Study Guide: Every Subtest Explained

Study the four AFQT subtests first: Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge and Paragraph Comprehension. Then add the technical subtests your target job needs. The guide is free to read here, with no email form.

The Preparing for the ASVAB page says a solid core of high school or college math, English and science is the base. It also says technical courses help with the Auto, Shop, Electronics and Mechanical subtests.

How the ASVAB is built

The computer version, the CAT-ASVAB, has ten subtests. This table shows the scored questions and the time limit for each, without the tryout questions (CAT-ASVAB page).

Each subtest also has up to 15 tryout questions, with longer time limits. The program's CAT page lists them separately from the scored questions above. The page gives no single total for the whole test.

Paper or computer?

Every MEPS gives the ASVAB on a computer. Most MET sites, the satellite locations for people far from a MEPS, use paper. The ASVAB fact sheet says scores should be very similar either way, so don't worry about which version you get. Do learn the strategy for each one, covered below.

Rules that apply to both

• No calculator is allowed (ASVAB FAQs). Practice your arithmetic by hand.
• The test is in English only.
• Scores can be used to enlist for up to two years after the test date.
• If you took the ASVAB at school (the student testing program), you need a verification test before the score counts for enlistment. The FAQs call it the Vtest.

Start here: the four AFQT subtests

Your AFQT score comes from these four subtests, and the Army, Navy, Air Force and Marine Corps use it to decide eligibility (ASVAB FAQs). Our AFQT score article explains the percentile, the categories and the retest waits. Each subtest below comes with one way to study it.

Arithmetic Reasoning (AR)

These are short word problems. You read a situation, decide which operation it needs, and work it out. The longest time limit on the test, 55 minutes, is for this subtest, so the problems take thought.

Study tip: before you calculate, say in one sentence what the question wants. That stops you solving for the wrong quantity. Do your practice on paper with no calculator, since that is how the test works.

Mathematics Knowledge (MK)

This covers core math facts and procedures: algebra, geometry and number rules. It is less about stories and more about knowing how the tools work.

Study tip: keep a one-page list of every rule you had to look up. Review it before each practice set until you stop looking things up.

Word Knowledge (WK)

You are tested on what words mean, either alone or in a sentence. The time limit is short, 9 minutes, so a word you know is answered fast and a word you don't know costs you.

Study tip: learn words in short daily batches and say them aloud. When you meet a new word in your reading, guess its meaning from the sentence first, then check it.

Paragraph Comprehension (PC)

You read a short passage and answer questions about what it says. The questions test what the passage states and implies, not what you already know.

Study tip: read the question first, then the passage, and look for the one sentence that answers it. When you miss one, find the sentence you overlooked.

The technical subtests

These six subtests don't count toward the AFQT. Jobs use them through line scores, which combine particular subtests. The line score your target job needs depends on the branch and the job, so ask a recruiter. Our score chart article shows how to read your score report, and the GT score article covers the Army's GT score.

• General Science (GS): broad science knowledge: life, earth and physical science. A review of high school science is a good place to start.
• Electronics Information (EI): basic electricity and electronics: circuits, current, voltage and common components.
• Auto Information: how cars work and the names and jobs of their parts.
• Shop Information: tools, materials and workshop practice.
• Mechanical Comprehension (MC): how forces, levers, pulleys, gears and fluids behave in everyday machines.
• Assembling Objects (AO): picturing how separate pieces fit together into a whole shape.

The Air Force presents the battery as nine subtests, with Auto and Shop combined (airforce.com). On the computer version they are still timed and counted separately, as the table above shows.

Study tip for the technical subtests: pick the ones your target job uses and skip the rest until the AFQT subtests are solid. If a topic is new to you, learn the vocabulary first. Many questions are easier once you know what the parts are called.

CAT vs paper strategy

The Preparing for the ASVAB page gives different advice for each version.

On paper:

• Answer every item. There is no penalty for guessing.
• You can go back to items you skipped.

On the computer (CAT-ASVAB):

• You can't go back to an earlier question.
• Rapid random guessing near the end of a subtest is penalized.

So on paper, skip a hard item, finish the section, then return to it. On the computer, give each question your best answer before you move on, and keep an eye on the clock early so you aren't rushing at the end.

Study plans by goal

These are our own suggestions, not a program from the testing authority, and nothing here predicts a result. Adjust them to your schedule. Our study-plan builder can lay out your weeks for you.

First choose your goal. If you only need to clear an enlistment minimum, work AFQT-first. If you want a specific job, find its line score and add the subtests behind it. Our branch minimums article lists the minimums we could confirm.

4-week outline (AFQT-first)

• Week 1: take a short practice set on each AFQT subtest and mark every miss.
• Week 2: work your weakest AFQT subtest daily.
• Week 3: work the second-weakest, and review your miss list.
• Week 4: mixed sets under timed conditions, with no calculator.

8-week outline (AFQT plus one job area)

• Weeks 1 to 2: baseline sets, then fix math basics.
• Weeks 3 to 4: Word Knowledge and Paragraph Comprehension.
• Weeks 5 to 6: the technical subtests your job uses.
• Weeks 7 to 8: timed mixed sets on both the AFQT subtests and your technical ones.

12-week outline (a target job's line score)

• Weeks 1 to 2: baseline sets across all ten subtests.
• Weeks 3 to 6: AFQT subtests, one at a time.
• Weeks 7 to 10: the technical subtests behind your job's line score, one at a time.
• Weeks 11 to 12: full timed runs, and a final review of your miss list.

Free resources from the testing program

The ASVAB test preparation disclaimer page lists these free resources:

• Practice tests and sample questions at asvabprogram.com/student.
• Sample questions on officialasvab.com.
• The Army's free courses at march2success.com.

We don't reproduce their questions here. Use the sources to check where you stand.

Choosing a paid study guide

The same disclaimer page says no third party has the questions that appear on the test. It also says the program doesn't recommend specific commercial guides and doesn't endorse paid programs that promise a set score. No guide can claim the program's backing, so use this checklist instead:

1. Edition year. Is it recent, and does it match the current test format?
2. All ten subtests. Some guides skip the technical ones. Check that Electronics, Auto, Shop, Mechanical Comprehension and Assembling Objects are covered.
3. Explanations. Does each answer say why it is right, so you learn the method?
4. No calculator. Do the math examples work without one?
5. Honest claims. Walk away from any guide that says it has the questions from the test or promises a score.

Our questions are original practice questions, not items from the ASVAB. The Prepanchor AFQT Core Pack for the ASVAB covers the four AFQT subtests, and our practice scoring is an estimated practice range, which is not a prediction of an official score. You can try the free ASVAB practice first.

ASVAB study guide FAQ

What is the best way to study for the ASVAB?

Start with the four AFQT subtests, take a short practice set to find your weakest one, and study that first. Then add the technical subtests for your target job. Practice without a calculator and under time limits, and keep a list of every miss and why you missed it.

What is the best ASVAB study guide?

The testing program doesn't recommend any commercial guide. Use the checklist above: current edition, all ten subtests, clear explanations, no calculator, and no claims of test questions or promised scores.

Is a 42 on the ASVAB low?

If you mean an AFQT score, 42 falls in category IIIB, which covers 31 to 49 (officialasvab.com). Whether that is enough depends on the branch and your education credential. See the AFQT score article for the full category table and branch minimums.

Is there a PDF of this guide?

No. This page is the guide, and it is free to read. There is no email form.

Which subtests do I need for the Air Force?

The Air Force publishes its own composite scores and presents nine subtests. Check the Air Force ASVAB page and our score chart article. For the Navy, Coast Guard and Space Force, we couldn't confirm details on their sites, so ask a recruiter.

Sources (checked 27 October 2026)

• Preparing for the ASVAB
• ASVAB Test Preparation Disclaimer
• The CAT-ASVAB
• ASVAB Fact Sheet
• ASVAB FAQs
• Understanding ASVAB Scores (applicants)
• ASVAB, U.S. Air Force