Hi Satish,
Your 2 practice CAT Scores are remarkably similar to one another, so assuming that you took those CATs in a realistic fashion, then you're closer to a 700+ than you probably realize. That having been said, it's not clear whether RC is only area that might be keeping you from your score goal.
After reviewing the Verbal section of this recent 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) On how many questions did you 'narrow the answers down to 2 choices' but still get the question wrong?
GMAT assassins aren't born, they're made,
Rich