Hi Seraphh,
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 3 CAT score results show that you essentially performed the same each time (about 570 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. Since these Scores stretch back several months, it's possible that you have developed some 'bad habits' during your studies that are keeping you from scoring higher. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level.
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:
Studies:
1) How many hours do you typically study each week?
2) What study materials have you used so far?
Goals:
3) When is your exact Test Date?
4) When are you planning to apply to Business School?
5) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich