Hi rishabhshreyas14,
Based on your last message, I'm hoping that you confirm a couple of details about your recent studies:
1) You've taken just 1 practice CAT since this past October.
2) You scored less than 650 (but within a few Quant and Verbal Scaled Score points of how you scored on your Official GMAT back in June).
If there were other CATs, then it would help to know those other score results (as they would help to point out patterns in your performances).
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, your recent CAT score result - along with your Official Score - shows that you essentially performed the same each time (about 640 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. Raising a 640 to the point that you can consistently score 720+ will likely require at least another 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.
From the information that you have provided, it's not clear what you are going to do differently in this next phase of your studies. If you continue to just work through practice questions in the same ways that you did before, then you will likely earn the same general score result. There are ways to improve on your current Score, but you're going to have to train to 'see' (and respond to) the GMAT in new ways.
1) Going forward, how many hours do you think you can consistently study each week?
GMAT assassins aren't born, they're made,
Rich