Hi HemalMahmud,
To start, you have to be careful about using large documents of subject-specific prompts (such as the RC1500 that you referenced). Those documents sometimes contain prompts from practice CATs/mocks that you might use in the future. If you have already answered all of those RC questions BEFORE you see them on a CAT, then you'll already know all of those answers - and your CAT Scores will be unrealistic and 'inflated' as a result (meaning you will not have a correct assessment of your actual 'ability level'; you will think that you are more prepared for the GMAT than you actually are).
While you did define your Score goal, you did not provide any additional information. If you're looking for any additional advice, then it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich