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The ASVAB is 10 subtests, and so is the practice here: each subtest has the scored question count and time limit of the computer-based test (the CAT-ASVAB), in 5 versions. There is no full-length practice exam. Practice one subtest at a time, or take all 10 back to back to sit the whole test: 135 questions in 3 hours 17 minutes.
These four subtests make up your Armed Forces Qualification Test (AFQT) score, which determines whether you can enlist.
Arithmetic Reasoning and Mathematics Knowledge are built from dynamic question templates. Nearly every question draws new numbers each time you take it, so you can retake these two subtests as often as you like, and each take starts from the version you've taken least.
These six subtests measure the knowledge and skills behind specific military jobs, and your scores on them help determine which jobs you qualify for.
Outside the two math subtests, each version of a subtest can be taken once, so every attempt is a new set of questions.
A practice subtest is not scored the way the real one is. The CAT-ASVAB adapts each question to your answers, mixes in unscored tryout questions, and reports standard scores and an AFQT percentile. Each version here is a fixed set of questions with no tryouts, and your score is the percent you answer correctly.
After completing an exam, you'll receive a performance breakdown by topic, making it easy to see where to focus your review and to track your progress over time.