I am finally done with the exam!!
The resources I have used are:
CR: "The GMAT Critical Reasoning Bible: A Comprehensive System for Attacking the GMAT Critical Reasoning Questions" from PowerScore
SC: Manhattan SC Guide
Quant: 4Gmat books, High school math books to cover the basics.
OG 11th edition, Paper tests.
When I first started preparation I was a bit overconfident of solving CR problems and I was missing a few questions on every exam. It was quite clear that I needed to improve in the CR area and the CR bible was a great blessing. Special thanks to CTG1983 for mentioning this book in one of his posts. The book presented a systematic approach towards each problem type in CR.
Manhattan SC guide was also a coherent collection of SC topics, mastery of which is absolutely essential.
For RC, just regular reading of GMAT quality passages is sufficient. I cannot stress how important it is to go back to the passage to verify an answer for every RC question.
The exam itself was quite an experience. I was able to finish Quant with 10 mins to spare. When I started prep I had to rush through to complete the last 5-6 questions. But after a lot of practice hours, I was able to overcome the problem. There were a quite a few logic type of questions so it is important to approach the problems with an open mind.
Verbal was a mixed bag. It was tough, for me, to identify the correct answer on a couple of SC questions. CRs were quite easy perhaps because I had read the CR Bible cover to cover a couple of times and revised the important concepts several times. In fact after completing the book, bold face CRs were the easiest CR questions on the exam.
I just wanted to thank the community for taking active interest in answering questions posted here. They were of great help.
Good luck with your prep.