Hi AjithKumar718,
The scoring algorithm on the Official GMAT is far more complicated than most people realize. Since that algorithm is proprietary, no GMAT company has an exact match for it, thus CAT scores can vary a bit based on the 'biases' involved in their respective designs. Have you taken either of the two free Official CATs (from
www.mba.com)? I ask because if you take either of those Exams under realistic Testing conditions that match-up with how you will take the Official GMAT, then that result would likely give us the most accurate measure of your current 'ability level' (which may be higher or lower than these 3rd-party results imply).
Assuming that these two CAT results are accurate - and your current level is the low-600s, then statistically-speaking, raising a 630 to the point that you could consistently score 700+ would likely require that you commit to at least another 1.5 - 2 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, predictable Exam so you CAN train to score at a higher level. That having been said, with just 3 weeks of study time, there will likely be a limit to how much you can improve.
Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
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) Are these the only two CATs/mocks that you have taken so far? On what dates (or approximate 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)?
4) 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