ASVAB preparation should start with the sections that affect your AFQT score, then expand to the full test. Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension deserve early attention because they shape the core enlistment score used by the services.
After that, study the additional aptitude areas: General Science, Electronics Information, Auto and Shop Information, Mechanical Comprehension, and Assembling Objects where applicable. These sections help describe career-field fit, so they should not be ignored even if AFQT is your first concern.
How to study ASVAB
Begin with the ASVAB sections page and decide which areas are weakest. Then run the ASVAB Practice Test in short blocks. Review every miss by skill, not by answer letter.
Because ASVAB formats differ, read the ASVAB format and timing notes before treating any practice timer as universal. For score context, use the AFQT and ASVAB scores page.
Verified against the official vendor reference: www.officialasvab.com.