Hi sauravkb,
With just a week to go before your Official GMAT, you don't have a lot of time to make any big changes to how you handle the Test. If it's still possible for you to reschedule your Exam, then you should consider doing so.
I'd like to know a bit more about your studies overall:
1) How long have you studied?
2) What materials have you used?
3) How have you scored on each of your practice CATs (including the Quant and Verbal Scaled Scores)?
4) What is your goal score?
5) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich