algebraic equations, fractions, high school- college equivilency   

I am trying to take my ASVAB tests to join the NAVY and while I was in school I was surprisingly good in math, I mean I was taking college level maths my freshman yr in high school. Now for some reason since I have been out of school for like 7 or 8 years its all gone I have no idea what any of this math is. And the thing is that my husband is in the NAVY right now and has told me in order to get into the medical field that I want to get into while in the service I would have score extremely high and I just took a practice test and didnt do so hot. Its kilss me because when I graduated high school I was in the top 50 of my class of 450 with a gpa of 3.7 and now I cant even score high enough on the asvab to get what I want. The minimum score on the test is a 36 and on my practice just now was a 41. Can somebody please help me with the what I need to work on??? I want to be a drug Psychologist in the Naval Hospital and that wont happen if I can tbring that score up by an increasing amount. Its like I have totally forgotten how to even work the problem out on paper let alone in my head like I used to.