Hi gmat7m,

When you mentioned the OG, I assume that you mean the OG13 or GMAT2015 book. If you're looking for additional Official questions, then there is the Quant-specific book by GMAC.

https://www.amazon.com/Official-Guide-GM ... t+official

GMAT assassins aren't born, they're made,
Rich

gmat7m wrote:I am done with my OG and want some additional practice (want to focus slightly more on DS).

Which book would be better Manhattan Advanced Quant or Kaplan 800 ? My concepts are clear, just want more practice on tricky questions and avoid silly mistakes. I would be taking the 6 MGMATs at a later stage.

For additional practice, you need not look any further than Beat The GMAT. There are thousands (more like tens of thousands!) of practice questions posted on this site, AND they're answered by expert GMAT instructors.

Also, to help you focus on one topic at a time, you can use BTG's tagging feature. For example, here are all of the questions tagged as statistics questions: https://www.beatthegmat.com/forums/tags/ ... statistics

You can also sort by Data Sufficiency questions.

See the left side of that linked page for more tag options.

Cheers,
Brent

As an MGMAT instructor, my position is biased, so I won't claim to recommend one book over another. I just have a few pieces of advice for you:

- Make sure you're paying attention to timing as well as accuracy. You've gone through the OG, but were you timing yourself? If you haven't yet taken any CATs, then you may be surprised by the difference in taking it under time pressure.

- Make sure you're making connections between questions within a particular topic, and not treating each question simply on a case-by-case basis.

The MGMAT Advanced Quant is an excellent resource for students who thoroughly understand the concepts and rules tested, and want to push themselves to attack more advanced structures. The book focuses on particular strategies for 700+ DS and PS problems, and contains hundreds of extremely difficult practice problems to test out those strategies.

Good luck!