Hi Wafas,
If you are planning on taking your 3rd attempt sometime before the end of December then you have no more than about 2.5 weeks of potential study time remaining - and it's likely that you need more than just some 'tips' to lock in that higher Score. I asked some specific questions in my prior post - and the answers to those questions are essential to defining how you be studying during this next phase of your studies (and whether you should consider pushing back your Test Date or not).
1) When did you take your prior Official GMATs?
2) How long have you studied in total? How many hours do you typically study each week?
3) What study materials have you used so far?
4) On what dates (or approximate dates) did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
5) What is your overall goal score?
6) When are you planning to apply to Business School what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich