It depends on the section. Across 60,534 practice answers, test-takers averaged 62.6 percent correct. Mechanical Comprehension was the hardest subtest at 46.8 percent correct, while Paragraph Comprehension was the easiest at 79.4 percent. The four AFQT subtests span the rankings: Mathematics Knowledge is fourth hardest, Arithmetic Reasoning is fifth, Word Knowledge is eighth, and Paragraph Comprehension is ninth.

What is the hardest section of the ASVAB?

Mechanical Comprehension, at 46.8 percent correct in our data, is the hardest section, followed by Electronics Information at 47.6 percent and Assembling Objects at 50.8 percent. The single hardest topic is Series & Parallel Circuits at 45.2 percent correct.

What is the hardest ASVAB subtest?

In our data, Mechanical Comprehension is the hardest subtest at 46.8 percent correct, followed by Electronics Information at 47.6 percent and Assembling Objects at 50.8 percent. Word Knowledge and Paragraph Comprehension rank eighth and ninth at 73.4 percent and 79.4 percent.

What is the single hardest ASVAB topic?

Series & Parallel Circuits, in Electronics Information, is the hardest qualifying topic in our data at 45.2 percent correct across 1,077 answers. The 3-D Object Visualization topic is sixth hardest at 46.5 percent correct across 1,117 answers.

What is the hardest math topic on the ASVAB?

Geometry: Area, Perimeter & Volume is the hardest qualifying AR or MK topic in our data at 54.6 percent correct across 2,079 answers. Number Properties & Absolute Value follows at 55.9 percent, then Exponents & Polynomials at 56.5 percent.

Which ASVAB sections are easiest?

Paragraph Comprehension at 79.4 percent correct and Word Knowledge at 73.4 percent are the easiest subtests in our data. Auto & Shop Information is next at 67.6 percent.

ASVAB Hero data study

The hardest ASVAB topics, ranked

Name: ASVAB practice-question difficulty by subtest and topic
Creator: ASVAB Hero

By the ASVAB Hero team. Published July 7, 2026. Updated September 16, 2026.

We looked at 60,534 ASVAB practice answers from 585 people using ASVAB Hero. Across all included answers, test-takers answered 62.6% correctly. Mechanical Comprehension had the lowest correct rate, while Paragraph Comprehension had the highest.

Key findings

Mechanical Comprehension is the hardest subtest at 46.8% correct.
Series & Parallel Circuits is the hardest qualifying topic at 45.2% correct.
Mechanical and electronics topics account for 9 of the 12 hardest topics.
Paragraph Comprehension is the easiest subtest at 79.4%, a 32.6-point gap from Mechanical Comprehension.
Geometry: Area, Perimeter & Volume is the hardest qualifying math topic at 54.6% correct.

60,534

practice answers analyzed

62.6%

answered correctly overall

46.8%

correct on the hardest subtest (MC)

79.4%

correct on the easiest (PC)

ASVAB subtest difficulty, hardest to easiest

Percent of practice questions answered correctly in each of the nine subtests. Questions are four-choice, so 25% is what pure guessing would score (the dashed line).

MC Mechanical Comprehension

46.8%

EI Electronics Information

47.6%

AO Assembling Objects

50.8%

MK Mathematics Knowledge

58%

AR Arithmetic Reasoning

61%

GS General Science

61.7%

AS Auto & Shop Information

67.6%

WK Word Knowledge

73.4%

PC Paragraph Comprehension

79.4%

Dashed line = 25%, the score from pure guessing on a four-choice question. Sample sizes per subtest range from 3,387 to 10,658 answers.

The 12 hardest ASVAB topics

Zooming in below the subtest level, these are the specific topics with the lowest correct rates (topics with at least 60 answers). Each links to a study guide. Nine of the 12 are mechanical or electronics topics.

Topic	Subtest	% correct	Answers
Series & Parallel Circuits	EI	45.2%	1077
Gears, Wheels & Axles	MC	45.3%	682
Forces, Friction & Pressure	MC	45.7%	726
Ohm's Law & Power	EI	45.9%	1344
Electrical Components & Devices	EI	45.9%	1130
3-D Object Visualization	AO	46.5%	1117
Motion & Projectile Physics	MC	47%	1136
Inclined Planes & Hydraulics	MC	47%	886
Levers & Pulleys	MC	48.7%	669
Spatial Counting & Orientation	AO	50.1%	1553
Conductors, Insulators & Materials	EI	53.6%	1150
Geometry: Area, Perimeter & Volume	MK	54.6%	2079

What this means for your study time

The results point to three practical priorities: mechanical concepts, electrical concepts, and geometry.

Start with circuits and mechanical concepts. Nine of the 12 hardest qualifying topics come from Mechanical Comprehension or Electronics Information. The list begins with Series & Parallel Circuits at 45.2% correct, followed by Gears, Wheels & Axles at 45.3%. See the full electronics tips and mechanical comprehension tips.

Do not treat every AFQT section as easy. The four subtests that decide whether you can enlist at all (Arithmetic Reasoning, Word Knowledge, Paragraph Comprehension, and Mathematics Knowledge) span the ranking. Mathematics Knowledge is fourth hardest at 58.0%, Arithmetic Reasoning is fifth at 61.0%, Word Knowledge is eighth at 73.4%, and Paragraph Comprehension is ninth at 79.4%.

Within math, geometry ranks hardest. The hardest qualifying AR or MK topic is geometry at 54.6% correct, followed by Number Properties & Absolute Value at 55.9% and Exponents & Polynomials at 56.5%.

To put these scores in context, see the ASVAB score ranges by branch for the minimum AFQT each service requires.

Find your own weak topics

Averages are a starting point, but your weak topics are your own. Take an ASVAB practice test to see exactly where you stand by topic, then use the score calculator to turn your scores into the jobs you qualify for. No account required.

Methodology

Sample: 60,534 practice-question answers from 585 people using ASVAB Hero from May 6 through September 16, 2026. The query window begins April 28, and May 6 is the date of the first included answer. Percent correct is answers marked correct divided by answers attempted.
Exclusions: internal and owner test accounts are excluded, as are remediation entries shown after a question reveal.
Scope: topic-level figures include only topics with at least 60 answers. Every question is four-choice, so 25% is the pure-guessing baseline.
What this is not: these are practice-question results on ASVAB Hero, not official ASVAB scores. The people here chose to study with a prep tool, so they are not a random sample of all test-takers, and adaptive practice can serve harder questions to stronger test-takers. Read the rankings as a signal of relative difficulty, not an official statistic.
What changed in edition 2: the sample grew from 12,368 to 60,534 answers. Edition 2 excludes internal test accounts, which edition 1 included, and Mechanical Comprehension replaced Assembling Objects as the hardest subtest.
Study by topic: Our ASVAB study guide covers each subtest and the hard topics in this list with targeted practice.

Cite this study

ASVAB Hero, "The Hardest ASVAB Topics, Ranked," edition 2, updated September 16, 2026, https://asvabhero.com/hardest-asvab-topics

Reporters, educators, and counselors may reuse the charts and data with a link back to this study. Download the aggregated subtest and topic data as a CSV file.