Hi Mandeep,
It seems that you have practised from too many books. The key is analyzing and revising the course/books that you are doing. If you are thorough in your analysis and you have clear strategies in your mind, then only you can go and ace on the test day.
See, the key point is that too many books and materials will muddle your thought process, and that may also createa havoc in your confidence at times. So, My advice to you would be concentrate on a few good books namely, OG 10, Kap800,
PR review Verbal,1000 SC(Say first 200/300 depnding on your stamina), analyze ur mistakes, see that you don't make them again and give a lot of tests.
With this, I'm sure u'll get a 700+ score.
Harsh