Hi Ruchira,
To start, a 750/Q49/V45 is an exceptionally high result for an initial CAT - so assuming that you took this CAT in a realistic fashion, then you are already a really strong critical thinker (and by extension, you might not need any Course-related resources to hit your Score Goal). Before I can offer any additional advice for your studies, I have a few questions about your studies so far and your goals:
1) Have you taken this CAT before (or seen any of the questions before; for example - in the forums here)?
2) Did you take this CAT in a realistic fashion (in one sitting, with no pauses, etc.)?
3) When are you planning to apply to Business School?
4) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich