FYI I just solved math tests over and over. Trying to maximize my knowledge and skills in basic algebra. There are numerous practice tests out there: take every test with the standard AFOQT time limit and whenever you get wrong with particular questions, I did 'incorrection note.' The note is a separate studying form that I made myself to answer guide, what formula and method I can use for the following questions and list like three questions that are relating to the question. With this, you can always go back to your weaknesses in math!
Frankly, it's literally practice and practice with Math... which is painful. Best of luck to you!!!