Hi rahul16singh28,
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 (+/- a few points). Many Test Takers who use a 'book heavy' study approach end up getting 'stuck' at a particular score level - and it appears that this has happened to you as well. This is meant to say that you might need to invest in some new, non-book study materials that emphasize the Tactics that you'll need to score at a high level in the Verbal section.
The 750+ score is the 98th percentile - meaning that 98% of Test Takers never score that high (regardless of how long they study or the number of times that they take the GMAT). Thankfully, NO Business School requires a score that high - so it's important to realize that the score that you "want" and the score that you "need" are not the same thing. That having been said, the Verbal section of the GMAT is as consistent and predictable as the Quant section is, so you CAN train to score at a higher level.
Since you're not planning to apply to Business School for some time, you can proceed with your studies however you choose. Before we discuss how best to proceed, I have a few questions about how you performed on the Verbal section of your last CAT (and the more EXACT you can be with your answers, the better):
After reviewing the Verbal section of this CAT, how many questions did you get wrong....
1) Because of a silly/little mistake?
2) Because there was some Verbal that you just could not remember how to do?
3) Because the question was too hard?
4) Because you were low on time and had to guess?
5) How many Verbal questions did you 'narrow down to 2 choices' but still get wrong?
GMAT assassins aren't born, they're made,
Rich