GMAT Math

Hi,

I took the GMAT on Monday and scored a disappointing 570. I am taking it again on September 10 so I need to get some intensive study in over the next few weeks (my goal is a 620 min, but I really want a 640).

I'm looking for either a quick class or tutor...or something (I went through the GMAT premiere book before the first test and started the GMAT 800) that can help me gain a better undertanding of the GMAT. Especially math! MATH, math, math.

Recommendations are more than appreciated. Please help!

Thanks!