Hi aluniquesmith,
The Quant section of the GMAT is not, strictly speaking, a "math test." While you will need math knowledge and you'll do a variety of math calculations, that section of the GMAT is far more about tactics, pattern-matching, critical thinking, etc. than you probably realize.
If your basic math skills are rusty/weak, then you might want to spend some time building up those skills before you start your GMAT studies. I suggest that you spend a bit of time at Khan Academy (
www.khanacademy.org) on the Algebra, Arithmetic and Geometry material there. The site is free and the training is more 'game-like' and fun than a traditional, dry math class would be.
As far as GMAT Courses are concerned, there are LOTS of different options (and they're not all expensive), so you should plan on doing a bit of research into the various options. Most GMAT companies offer some type of free resources (practice problems, Trial Accounts, videos, etc.), so that you can 'test out' a product before you buy it (we have a variety of free resources at
www.empowergmat.com). I suggest that you take advantage of all of them, then choose the one that best matches your personality, timeline and budget.
GMAT assassins aren't born, they're made,
Rich