Hi jsherman10,
You've given yourself plenty of time to study for the GMAT, which is good. Many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' scores though - and raising a 400 to a 600+ will require that you make significant improvements to how you handle BOTH the Quant and Verbal sections. Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on work so far and your goals:
1) What were the Quant and Verbal Scaled Scores for this initial CAT?
2) Did you take the FULL CAT (with the Essay and IR sections)?
3) When are you planning to apply to Business School?
4) What Schools are you planning to apply to?
5) Going forward, how many hours do you think you can consistently study each week?
GMAT assassins aren't born, they're made,
Rich