Hi alantjee,
Many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so you might naturally improve over time as you continue to study and hone your skills. That having been said, GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, your various CAT score results - along with your Official Score - show that you essentially performed the same each time (about 700 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. To consistently score 730+, you'll need to train to 'respond' to the GMAT in new ways - and that training will likely take more than just a couple of weeks. This is meant to say that rushing in to retake the GMAT is probably not a good idea at this point - and planning for at least another month of study would be a good idea.
You might also choose to purchase the Enhanced Score Report for your first Official Test. 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.
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) What type of study routine were you following? How many hours did you typically study each week?
2) What study materials have you used so far?
3) What "brand" of CAT was your 3rd CAT? Did you retake one of the earlier 2 CATs you had taken?
GMAT assassins aren't born, they're made,
Rich