gmatdelhi
Do you think it's necessary to go through the PowerScore CR bible? What were you scoring like before and after the book? I've been trying to improve on my CR with free resources from the net...not really inclined towards buying a whole book dedicated to CR and go through even more theory...is CR really that difficult?
For whatever reason I had difficult doing CR questions. I would say I went from around a 70-75% hit rate to an over 95% hit rate. I'll try to give an example of how it helped me.
-Assumption questions were especially tough for me. However, after reading the CR Bible, I felt like I knew all the potential types of correct answers. For example, one out of every 8 questions, I would wager, would have a correct answer that eliminates the possibility that the stated relationship in the stimulus is reversed. For whatever reason, such an answer never would have occurred to me prior to reading the book and I very likely would not have guessed that answer choice. After reading the book, if I ever saw such an answer choice, I would immediately know that it's the right answer. Also, I thought the Negation technique described in the book was a great way to double check that your answer choice is correct.
I would say I wasn't that inclined to go over the theory of CR either, but I really do feel strongly about this book. It isn't necessary to do well on the GMAT, but it will guaranteed help you if you do choose to go through it.