Hi nines,
Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you studied for only about 4 weeks, then it's likely that you just have not put in enough time and effort to consistently score at that higher level yet.
In addition, you have to be careful about confusing "quantity" of study with "quality" of study. I've never asked anyone to study 30+ hours a week - and while it's great that you might have the available time to study that much, with that number of study hours, you would run the risk of 'burning out' before Test Day (and that is something that may have already happened - and that we want to avoid in the future). If you are going to try to study that much, then I suggest that you take one hour "off" for every two hours of study. For example, you could study for 2 hours, then stop for an hour, then study for another 2 hours, then take an hour off, etc.
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
1) 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)?
2) What is your overall goal score?
3) When are you planning to apply to Business School?
If you took your Official GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich