Hi aishwarya garg,
You seem to have posted "versions" of the same message in several Forums. Here (below) is my response from one of those posts. In answer to your immediate question here though - as you continue to study, you will obviously take some additional practice CATs. Unfortunately, taking those CATs is NOT how you're going to improve (they're a part of how you're going to measure your progress). You're likely going to need to invest in some new GMAT study materials. I'll be happy to make some suggestions, once I have a bit more information on how you studied the first time.
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When a Test Taker's Official Score is significantly lower than his/her practice CAT scores, the reason is usually unrealistic practice or simply a "bad" Test Day. This means that we have to take a good look at how you took your CATs:
1) Did you take the ENTIRE CAT every time (including Essay and IR) or did you skip sections?
2) Did you ever take a practice CAT a 2nd or 3rd time?
3) Did you ever do anything unrealistic or non-Test-like (pause the Test, take it on a laptop computer, take it at home, etc.)?
By giving yourself another 2 months to study, you have a lot of time to improve and fix whatever "issues" you had when you studied the first time.
1) Did you use any other practice materials besides the print materials that you mentioned?
2) What schools are you planning to apply to? And when?
GMAT assassins aren't born, they're made,
Rich