Hi tennis202,

To start, a 620 is a great initial CAT score (the average score on the Official GMAT hovers around 550 most years). The time it might take you to get to the point that you can consistently score 700+ will depend a great deal on your current skills, strengths and weaknesses - so 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 have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
3) Have you taken just this one CAT/mock or were there others? 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)?

Goals:
4) What is your overall goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School and what Schools are you planning to apply to?

GMAT assassins aren't born, they're made,
Rich