Hi vishalb.patel62,
Unfortunately, working through a book of practice questions is not equivalent to taking the FULL GMAT under realistic conditions, so there is no 'score equivalency' between the two activities. If you want to know how well you might do on the Official GMAT, then the best way to measure your potential is to take a realistic, FULL-LENGTH CAT (with the Essay and IR sections). I'd like to know a bit more about how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What materials have you used?
3) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
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