Hi 99sport,
In another post, you noted that you had recent taken the GMAT and scored 580. Training to raise that Score to the point that you can consistently score 700+ will require that you study in a really specific way for at least another 2 months - so before you invest in any new study materials, it would help if you could provide a bit more information on how you've been studying and your goals:
1) What were your Quant and Verbal Scaled Scores on your Official GMAT?
2) How long have you studied? How many hours do you typically study each week?
3) What specific study materials have you used so far?
4) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
If you took your GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich