My best advice is not to exhaust the OG too quickly! Before you touch the OG, make sure you've mastered the concepts in you strategy guide by doing the problems at the end of the chapter. Then hit the OG problems in short sets, followed by intense review. You should be reviewing every problem, regardless of whether you missed it. (In fact, it's best to review before you even check your answers.)
Here are a few good questions to ask:
*What specific type of problem is this (e.g. "Combined Rate problem--add the rates"), and how can I tell?
*What tricks/traps were there? Did I fall for them?
*How else might I have solved the problem?
*What is the optimal approach to this problem, and how can I tell?
*How can I apply what I've done here to other problems?
*How am I going to remember what I've learned?
Only then should you seek out more problems, and even then you should space them out. (Don't do every single Rate problem and leave nothing for later!)
I'm not just encouraging you to slow down because official problems are in short supply. This really is the best way to improve! Every week I meet another student who has done all the OG problems and isn't close to the score they want. That approach simply doesn't work. You have to work for mastery, and create procedures that you can repeat successfully on test day.
Now that I've said all that, here are a few sources of additional material:Official Sources
*2nd edition Quant and Verbal Review books (I'm guessing you've already thought of those)
*older editions of the OG (the 10th edition is old enough to have a large # of problems that aren't in the OG13)
*extra resources on mba.com--the best deal is probably the $30 sets of "paper tests" (old--but still relevant--questions from the pre-CAT era)
*practice problems in GMATPrep (there are a few extra problems of each type in there)Unofficial Sources
*Every company can recommend its own products, but I'll speak for ours. Our full online resources include hundreds of problems in our Question Banks and Drill Sheets. If you're doing well in math, you might also benefit from our Advanced GMAT Quant
*Completed CATs. Don't forget to go back through your old CATs. They're a great source of review material! If you're using ours, you can pull up lists of all your completed problems by topic.
*LSAT materials. Logical Reasoning on the LSAT is very similar to Critical Reasoning on the GMAT. While the LSAT has some question types you won't see on the GMAT, and it sometimes gets into more abstract reasoning, you can also find lots of standard questions--strengthen/weaken, conclusion, etc.--of very high quality.
Okay, I think that does it. If you take my advice and spend most of your time reviewing, all that should last you for years! Hopefully, you won't need to study for that long . . .
Thanks for your valuable advice!!I really appreciate for your time...