I have been having major problems with CR of late (65-70% hit rate).....and have gone studied all books from Kaplan
to princeton to OG to manhattan.
I came across this highly recommended book 'Powerscore - Logical thinking Bible'. Now this book is actually for the LSATs (Law exam) but the topics covered are exactly the same as for the GMAT. Go through the book and you'll know what I mean. My hit rate has climbed upto 87-89% after a week itself! It is a relatively unknown book (as I've seen numerous recommendations for other books....but not for this one). This is a 4.5 rating out of 5 at Amazon and it's actually FAB!!
I am an average guy with no engineering/maths/science degree so this books covers the complex fundamentals with relative ease.
This is my giving back a little something to the community here at Gmatclub. You guys have helped me through SC!!!!! Pdf version attached.