@sameer004
Here is a suggestion for reading. Practice all the reading sections in at least three or four Cambridge practice test papers (I think Book 8 is the latest as of this posting). You are probably focussing on GT. Try the Academic Reading sections too. They are tougher and in some sense an overkill, but if you are able to crack them, you will find that the GT reading test (especially the long passage in Reading Section 3) is child's play. Also, when you do the reading tests, try to time yourself and stick to the 1 hour specified. Your 8.5 in listening makes me confident you can get a better score in reading. All the best!
-Ganman
PS: This is my personal view and there is no single formula that will work for all. This advice also depends on whether you have enough time for the test. If your test date is very close, or if time is an issue, it is better you focus on GT reading only and not waste time doing the Academic tests.