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ASVAB Technical Subtests: Choose the Right Skill to Study

The six subjects outside the AFQT ask you to use different kinds of knowledge. Learn to distinguish a component question from a physical-principle or spatial question, then choose one focused lesson for your next study session.

Test Ninjas Research · Updated September 29, 2026

What you’ll learn

  • Recognize what each of the six subjects asks you to do.
  • Match a missed question to a specific concept to review.
  • Choose a focused lesson while preparing for the complete test.

Learn the method

Turn a missed question into a useful study task

Two questions show a wrench. One asks for the tool’s name. The other asks why pushing farther from the bolt increases its turning effect. Should you review the same skill for both?

  1. Separate the object from the task

    The wrench appears in both questions, but the first asks for tool knowledge and the second asks for a physical relationship. The pictured object alone does not identify the skill.

  2. Choose the matching subject

    Tool names and intended uses fit Shop Information. Force, distance and turning effect fit Mechanical Comprehension. An automobile-system function would instead point you toward Auto Information.

  3. Write one actionable review note

    Replace “bad at technical questions” with either “compare wrench types and their uses” or “practice torque = force × perpendicular distance.” Each note tells you what to study and how to check it.

Review tool identification for the first question and torque for the second.

Why the tempting approach fails

A familiar object can appear in several subjects. Memorizing its name will not solve a question about how it moves, and learning a force formula will not identify an unfamiliar tool.

Explain it back

How would you distinguish an electronics question from an assembling-objects question if both include a diagram?

Compare your reasoning

An electronics item asks about an electrical quantity, connection or component. An assembling-objects item asks about the spatial arrangement of pieces. Match the requested reasoning, not simply the presence of a picture.

Choose one lesson to start

Each guide begins with a method and a worked example, followed by a 12-question practice set. Pick the skill you want to understand next; you can work through the questions a few at a time.

How these subjects fit together

Use these distinctions when planning which subjects to review.

Separate enlistment scoring from job composites

The AFQT uses Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge and Paragraph Comprehension. The other subtests can matter for the composite scores associated with military occupations. Check current requirements for the service and job you are considering, while continuing to prepare for the complete test.

Understand how Auto and Shop are reported

The computer version tests Auto Information and Shop Information separately, then reports a combined AS score. The paper version presents them as one Auto and Shop subtest. Their separate guides are useful for identifying whether an error comes from automotive knowledge or tool and workshop knowledge.

Match practice to the skill

Science and technical questions often call for definitions, component functions or physical relationships. Mechanical diagrams require tracing forces and connections; Assembling Objects requires comparing shape and position. Use a method suited to the task instead of applying the same memorization routine to every area.

The six subjects at a glance
  • General Science: physical and biological science concepts
  • Electronics Information: electricity, circuits and components
  • Auto Information: automobile systems and technology
  • Shop Information: tools, materials and workshop practices
  • Mechanical Comprehension: physical principles and simple machines
  • Assembling Objects: spatial relationships and connecting parts

Turn your mistakes into the next lesson

Before moving on, choose one error you can explain. Rework that question with the solution closed, then revisit the skill in a later session to check what you remember.

Common mistakes to check

  • Ignoring all six areas because they do not enter the AFQT.
  • Assuming a strong AFQT automatically satisfies every job composite.
  • Combining Auto and Shop practice without tracking which subject caused an error.
  • Memorizing a diagram’s answer instead of the relationship that explains it.

Study one example, then try a small set

Read the worked example in one subject guide and explain its method in your own words. Try a few practice questions without opening their solutions, then compare your reasoning with the explanations. Record the concept or diagram feature you need to revisit; twelve questions are a sample, not a full diagnostic of your ability.

Build breadth before narrowing your focus

Review the basics of each subtest, then spend additional time on gaps and on the areas relevant to your goals. Confirm current job requirements with your recruiter. A focused plan can prioritize a subject without treating the rest of the ASVAB as optional.

Test format and scoring reference

These six subtests do not contribute to the AFQT. Their results contribute to relevant service-specific composites used in job qualification. Scores are one part of eligibility; a particular practice result does not guarantee a job or enlistment.

View timing for all six subtests
The six technical subtests on the proctored CAT-ASVAB
SubtestWithout tryout questionsWith tryout questions
General Science (GS)15 scored questions · 12 minutes without tryouts15 possible additional unscored questions · 25 minutes total with tryouts
Electronics Information (EI)15 scored questions · 10 minutes without tryouts15 possible additional unscored questions · 21 minutes total with tryouts
Auto Information (AI)10 scored questions · 7 minutes without tryouts15 possible additional unscored questions · 18 minutes total with tryouts
Shop Information (SI)10 scored questions · 6 minutes without tryouts15 possible additional unscored questions · 17 minutes total with tryouts
Mechanical Comprehension (MC)15 scored questions · 22 minutes without tryouts15 possible additional unscored questions · 42 minutes total with tryouts
Assembling Objects (AO)15 scored questions · 18 minutes without tryouts15 possible additional unscored questions · 38 minutes total with tryouts

The computer test includes unscored tryout questions in selected subtests. The longer time shown is the total for a section with tryouts, not extra time to add. These figures describe the proctored CAT-ASVAB, not untimed PiCAT or our practice sets. See the official What to Expect page's questions and timing table and the guide to test versions.

On paper, Auto and Shop form one combined subtest. Each subject guide includes paper timing alongside the computer format.

Which subtests contribute to service line scores →

Frequently Asked Questions

General Science, Electronics Information, Auto Information, Shop Information, Mechanical Comprehension and Assembling Objects. This page links to a separate practice guide for each.

Auto and Shop Information are administered separately on the computer and together on paper. Both versions report their combined result as AS.

You can prioritize relevant gaps, but prepare for the complete test and confirm current job requirements with your recruiter. Other opportunities may depend on different composites.

Each guide includes 12 original questions with explanations, for 72 questions across these six subject sets. They are study materials, not official ASVAB items or a calibrated score predictor.

Explore the other ASVAB subject guides

Sources and materials. Subtest descriptions and timing were checked on September 29, 2026 against the Department of Defense’s What to Expect guide, sample questions and score guide on officialasvab.com. Teaching examples, diagrams and practice questions are independently authored Test Ninjas materials. Test Ninjas is not affiliated with or endorsed by the Department of Defense.

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