Hi Paridhi18,
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, most of your 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 results go back several months, it's likely that you have gotten 'stuck' at this particular 'score level'. Statistically-speaking, raising a 570 to the point that you can consistently score 710+ will likely require at least another 3 months of consistent, guided study - and you'll have to make improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level. While I understand that you really want to be done with the GMAT in the next month, if you ultimately "need" a 710+ to apply to Business School, then THAT Score Goal has to come first - and you should consider pushing back your Test Date and application plans.
Before I can offer you any additional advice for your studies, 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 have you been following? How many hours do you typically study each week?
2) Have you used any other study materials besides the books that you mentioned?
3) 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