Hi guys,
Powerscore CR is a good book, but it does not have enough practice problems. To really increase accuracy, it is necessary to practice as many questions as possible and understand each of the options explained. However, it is very important that you rely on good source. During my preparation, I found that lot of CR questions were not as clear as were the
OG's. On the gmat, the cr questions are very clearly worded. I found
e-gmat CR questions very closely resembling to the
OG types of questions. I must say that your understanding of GMAT LOGIC very much depends on the source of questions.
Do's:
powerscore CR
e-gmat CR
Ron's videos
OG/
OG VerbalDont's:
any random cr question on the forums(you should rather search for explanations to your questions)
trying to come out with formal logics to particular types of questions (except for Assumptions, in which you can apply Negation Technique)
Sources that confused me(I will not advice to rely on these):
Kaplan Verbal
Princeton Review
Princeton Verbal
I will be happy to help...