Nineteen seconds
Word Knowledge is 35 questions in 11 minutes. That is about 19 seconds per question — the tightest pace on the whole paper form, and it is not close. Arithmetic Reasoning, by comparison, gives you 72 seconds.
The questions themselves are not hard. You are shown a word and asked which of four options most nearly means the same thing. What is hard is that there is no time to work it out. Either you recognize the word or you move on.
Why it is worth the effort anyway
Because it counts twice. The AFQT doubles Word Knowledge and Paragraph Comprehension, so this eleven-minute subtest carries more weight toward enlistment than the 36 minutes of Arithmetic Reasoning does.
How to practice it
Not by reading a word list once. The skill being tested is recall speed, so practice it the way it is tested: timed, at pace, in blocks. Sit the subtest on its own against a clock and look at what the misses have in common — usually they are words you half-know, which is worse than not knowing them, because a half-known word is the one you spend fifteen seconds on.
A candidate who has never felt 19 seconds a question has not practiced the hard part of this subtest. That is the whole reason our practice exams keep the real clock rather than a comfortable one.
Every wrong answer, explained
On our exams each wrong option carries its own sentence saying what it actually means and why it is not the answer — because on a vocabulary subtest, knowing which word you confused it with is the entire lesson.
Practice the real thing
Our ASVAB exams are full length and written from scratch — every wrong answer carries its own explanation, so a child learns what they got wrong and why. Ten questions are free, with no account and no card. After that it is five credits an exam.