Hi Yenal,
Since you posted this in another thread, I've passed over my response from there:
You've done quite well so far (since you've been able to raise a 470 to a 630 working on your own). Since your scores have not 'leveled off', I suggest that you continue to study as you see fit. With a 630, you're closer to a 680+ than you realize - and you have the potential to pick up points in BOTH the Quant and Verbal sections.
Since your last CAT was at the end of August, you should plan to take another FULL CAT soon (perhaps this weekend). That result will give us an idea of whether you need to make any adjustments to you studies or not.
GMAT assassins aren't born, they're made,
Rich