Manattahn Gmat Challenge Problems for Quant

[Stacey Koprince]

Don't be scared by the challenge problems - that's why they're called "Challenge Problems." Half of them are harder than anything even an 800-scorer would see on the test.

Also, don't study them. Really, those are just for people who are absolutely maxed out at math and can get even the hardest OG questions right in under a minute. That is to say, not very many people.