Good luck at improving your Quant score, but I can speak from experience when I say that maintaining a near-perfect score of V47 (99%) is going to be tough, meaning that even if your Quant improves, your composite will probably go down. This is probably worth the sacrifice, though, since there is more to a GMAT score than the composite (especially for the Indian B-schools to which you referred, who prioritize high Quant scores).
Basically, in order to score 99% (760+) you need a little bit of luck: you need to ace both the Verbal and the Quant in one shot, with very little room for error. Based on my ESR studies, I have come to these general conclusions about the (steep!) Verbal scoring scale:
51/51 = 0 wrong
48/51 = 1 wrong
47/51 = 2 wrong
46/51 = 3 wrong
42/51 = 5 wrong
40/51 = 7 wrong
For comparison, last test I scored a Q50/V42 and also earned a 750. If you get more than 2 wrong on Verbal, then you're doomed unless you score a Q51. Even then, the most you can afford on Verbal is 3-4 wrong to stay in the 99th percentile.
The Verbal section appears to getting tougher over the years, unfortunately--while the difficulty of Quant has not increased much, imo. Here are my Verbal scores over the years:
2012: 48 (-1)
2015: 47 (-2)
2016: 46 (-3)
2017: 40 (-7)
2017: 42 (-5)
Here are my Quant scores over the years:
2012: 47 (-8)
2015: 42 (-9)
2016: 44 (-12)
2017: 46 (-9)
2017: 50 (-6)
GMAT scores tend to vary 4-5 points in either direction on test day, due to random, somewhat uncontrollable factors and test-day pressures. And hey--the GMAT is hard. On Quant, study and drill your weaknesses again, then give it another go--no major harm done with 8 lifetime attempts.
I'm not saying that you can't make it happen...I just want you to know that you don't have much wiggle room on the 2018 version of the test. Prove me wrong!
Good luck,
-Brian