Gmat OG

It's fair to say that official problems are the best problems to study (because you know for certain that they're similar to what's on the real test.) That said, the OG isn't the only source of official Quant problems. There's also the Official Guide to Quantitative Review and the problems in the GMATPrep software.



It depends. Are you doing the problems with a timer? Are you doing them in sets of multiple problems at a time? If not, try it. GMAT Quant problems aren't hard because the math is hard, usually. They're mostly hard because you have to plan your solution and implement it very quickly, while under pressure, without having seen the problem before and without having any info about it.

If you're doing them with a timer and doing sets of problems, and you're still getting them all right, that's a good sign! And in that case, you should be doing harder problems. But first, you should definitely do a practice test - doing a full practice test can be a very different experience from doing problems out of the OG.

The difficulty of problems on the actual GMAT isn't fixed; it changes depending on how well you're doing. It's quite possible that your test will mostly have problems that are harder than the ones in the OG, if you're very strong in Quant. But in general, most of us will be able to find good problems to study in the OG.