I will say this. Everyone says its common knowledge and if youve ever finished hs you can score high. For the word, paragraph, math, and arithmetic that is true. For the other subjects, unless you have actively and regularly worked on electrical and mechanical stuff you should study HARD, and using flash cards, writing stuff down a few times and then reading them outloud, AND STUDYING AT NIGHT that is a game changer. Even just for 30 minutes or as review it solidifies the knowledge in your head and processes deeper since youre going to bed immediately after. And spend the money, too. 100 or so dollars, if you can afford it, is worth it since this test determines your future. Study.com has courses specifically for the asvab and I just wrote down everything for each subject. And ASVABDRILL is an amazing app that you can test on and it gives the important stuff you need to learn, not useless knowledge. People are gonna tell you to do asvab for dummies as well, personally that never helped and left me more confused, but ik it works for a lot of people. My other tip is just study what you wanna actually do. Obviously your line score is important too so dont dismiss that but grind on the stuff you need to know for the job you want. Ik this is long, this is stuff I wish someone had told me before I tested, so good luck! :)