Hi a12021017,
Most of the "math" that you'll have to deal with in the Quant section can be handled by a reasonably trained 15-year old, so advanced math (or "hard math" knowledge) is not required. You do need to know your math rules and formulas and you do need to be able to do basic math by hand. Some subjects require knowledge of special formulas (permutations, combinations, probability, etc.) or rare rules (certain Geometry or Number Property concepts), but you don't need to be a genius to get these questions correct - you need to pay attention, take notes, stay organized and do work.
Top Test Takers tend to be really good at using tactics and pattern-matching, so THOSE are areas that you would want to emphasize during your training. The ability to answer questions using more than once approach is also valuable, as that skill will help you to choose the fastest/easiest option for each question that you face (and can get you out of trouble if you end up "stuck" on a prompt).
GMAT assassins aren't born, they're made,
Rich