GMAT Quantitative Strategy Guide Set (Manhattan Prep GMAT Strategy Guides)

Very very good

Perfect for those wanting a quick reminder of formulas and strategies for solving quant problems.

Waste of money. Don't buy it.

Exelent

Very good and comprehensive prep guide for the quant section, as it offers a lot of examples and questions. The part that I like the most is the detailed explanation of every question. Moreover, you get access to additional questions on their website.

If you're already strong in basics, go for it. Its just a strategy guide, i.e., it only tells how to prepare for the exam, how to recognize questions, how to save time, etc., If you want to start from the beginning go for the OG 2016 by GMAC.

Its a very good set of books, it has shortcuts as well which helps in real time exam, amazingly written and well explained.

Must Have

Good book