GMAT Strategy

I recently took my diagnostic and will begin studying this week in preparation for sept 30th sitting. So roughly 30 days. My math score was pretty bad at the 60% with 40 and my verbal was 38 and 90%. what should I do to increase my quant score? Does anyone have any recommended books. I am usually good at math but just forgot a lot of formulas and basic things I need a refresh on. Help please.

If you're looking for a more basic math review, then I understand that the Princeton Review is a good place to start. You could also consider buying other more focused guides, such as the series offered by MGMAT.

I myself have not used any of these books, so I can't give you a personal opinion. I guess this is just a sort of feeling that I get from our members' posts...