Hi RashmikaAnegama,
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) Over the last 3 months, what type of study routine have you been following? How many hours do you typically study each week?
2) Have you used any other study materials besides the ones you mentioned?
3) 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) Are you planning to take the At-home GMAT or are you planning to take your GMAT at a Test Facility?
5) 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