Just to share some GMAT studying tips for people who are still studying for GMAT
Official Guide -
OG is the bible. I did the SC verbal section twice, analyzed twice. One analysis is done on each problem by testing points; One analysis is done by different test points with question numbers. Then reviewed another time before the test.
OG SC is the SC bible. We shall worship it and read it every night before we go sleep. Better we should sleep with it under our pillow, and let its electromagnetic field influence our brain.
Princeton Verbal Review - I found its CR strategy is very helpful.
Kaplan 800 - CR strategy is great addition to Princeton.
LSAT - I got a set of LSAT CR review questions from my friend. I found it to be very helpful. LSAT CR questions are harder than GMAT. Therefore, after you go through dozens of LSAT questions, you'll find GMAT CR to be easy.
GRE - RC was very painful for me at the beginning. What's more painful is GRE RC questions, I did 4 GRE RC passages every day for about a week. At the end of the week, I couldn't keep up, because I almost always want to puke when I look at the GRE RC passages. But, then you come back look at GMAT RCs. They are a lot easier, and you are a lot happier. and GMAT RC has a better logic structure than RC. To first identify its logic structure, one will find the reading become much easier.
Math - Since I come from engineering background, I found it to be easy. You need to be careful and more careful and even more careful. A lot of the mistakes are made when you are not careful.
OG + Kaplan 800 train yourself how to be careful under pressure. And, don't drink water before the exam. Halfway through my math test. I really wanted to go to bathroom, so the last 15 questions I did them on a fly, didn't go back check them. Maybe that's why I didn't get 51 on Math.