Anyone know a good site to learn math for the ASVAB?

I took a practice ASVAB test and I nearly aced all the word and paragraph comprehension questions. My problem is on all the math questions I missed about half of the questions. My problem areas are Fractions, Decimals, Ratios, conversion (F to C and etc.), Perimeter and other geometrical questions, and some basic math (For ex. (5x-2+3a) - (1x+2a-1) = (3x-12a+50) ). I'm trying to find an online site to boost my math skills that would be of benefit to me taking the ASVAB test preferably anything I don't have to pay for. Anything to help with the science part would be of use too.