Hi clarkie,
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 how you've been studying and your goals:
Studies:
1) How long did you study before taking the GMAT for the first time?
2) What study materials have you used?
3) How did you score on that initial GMAT (including the Quant and Verbal Scaled Scores)?
4) What studying have you done since you took the GMAT in November?
Goals:
5) What is your goal score?
6) What is your exact Test Date to retake the GMAT?
7) When are you planning to apply to Business School?
8) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich