This is a common request, but I think the
OG is a better resource than most people give it credit for. Certainly if you are performing at a very high level in quant, you will find many of the
OG problems fairly easy. However, this does not mean you shouldn't spend many hours working through it. First, it is highly representative of the style and content of the questions you'll see on the GMAT. Second, it *does* contain quite a few very difficult problems. Third, in order to hit a high score in quant, it is important to be *very* accurate on the lower-level problems.
So I recommend that you spend plenty of time working through the
OG in timed sets. You can push the time a little faster if you're really finding the problems easy. Then you should spend lots of time reviewing your work and looking for ways to work more efficiently and reduce your error rate.
If after all that you still need a source of more difficult material, I humbly suggest our Advanced GMAT Quant strategy guide.
76000 Subscribers, 7 million minutes of learning delivered and 5.6 million video views
Perfect Scores
http://perfectscores.org
http://www.youtube.com/perfectscores