Hi romie75,
From what you describe, you're not facing any immediate application deadlines - so studying for the GMAT now (far in advance of when you might actually "need" your Score) is a smart choice. By extension, if you end up needing to study a bit more, then that's not a big deal (and it's not a 'bad thing'); many GMATers take the Exam more than once and Business Schools generally do not care if you retest.
Since you are so close to your Official Test Date, you should limit your studies to general practice and light review (NO CATs/mocks and NO 'cramming') - you would be better served by getting some extra rest so that you can go into Test Day calm, clear-headed and ready to work.
Once you have your Scores, you should post back here (or you can feel free to PM me directly) and we can discuss the results and how you might best continue with your studies (if that is something that you want to do).
GMAT assassins aren't born, they're made,
Rich