Hi Sam,
To start, I suggest that you actually do 'some Quant and some Verbal' each week (as opposed to the "all of one, then all of the other" that you're thinking about). You'll likely find it easier to retain everything if you're working on a mix of subjects each week.
Before I can offer you any additional advice on how to improve, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich