Hi bhupendrajaiswal,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, your 3 CAT score results - and your Official Score - all 'revolve' around about a 600, which shows that you essentially performed the same each time (+/- a few points). If your goal is to score significantly higher, then you might be making some of the same 'mistakes' during your studies now that you made when you studied before.
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)?
4) What were your Quant and Verbal Scaled Scores on the Official GMAT?
Goals:
5) What is your goal score?
6) When are you planning to take the GMAT?
7) When are you planning to apply to Business School?
8) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich