Nobody could advise to improve my math :$?

Sorry!

I purchased the Kaplan GMAT Premier Program and an OG. I didn't get around to opening the OG.

However, I hear the OG Math supplement is good.

I heard the OG math got a overlap with the yellow book :$?

If by "Math workbook" you mean the Kaplan math workbook then its great. It would give you a good review of all the concepts tested on GMAT. Has many exercises to strengthen your knowledge on various topics. If you want indepth review of one particular topic like Number properties or inequalities i would recommend the Manhattan GMAT's strategy guides for such topics. Each book is dedicated to a topic and offers a lot of practice.

The official Guide for Quant review is also great as it gives you a lot of past GMAT questions to practice, but the review is mediocre and so are the explanations. Also i hear that the questions are actually easier than the real test. So before buying it, you might want to go to a books store like Barnes and check it out.

Thanks! What do you guys think of the princeton review books?

i found the princeton review book extremely lousy.... i felt like all it did was trying to "teach" me guessing strategies.... pretty worthless imo, especially if youre going for a 700+

The challenge archive of Manhattan GMAT has good problems.