Hi nikitadadhich,
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) What study materials have you used so far?
2) When was the last time you took a NEW, FULL-LENGTH CAT? How did you score (including the Quant and Verbal Scaled Scores)?
3) Have you taken the Official GMAT (and if so, then how did you score?)?
Goals:
4) What is your goal score?
5) What is your exact Test Date?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich