Hi Apurv14,
I'm sorry to hear that Test Day did not turn out better. If you were 30-minutes late for your Test appointment, then that could have certainly caused some extra stress on Test Day, but that's not enough to explain a 150-point drop in your Overall Score - so we will have to consider some other potential factors. When these types of score drops occur, the two likely "causes" involve either something that was unrealistic during practice or something that was surprising (or not accounted for) on Test Day. Before we discuss any of those potential issues though, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) What were your Quant and Verbal Scaled Scores for your Official GMAT?
2) How long have you studied? How many hours do you typically study each week?
3) What study materials have you used so far? What “brands” of CATs/mocks have you used?
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)?
Goals:
4) What is your overall goal score?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich