I feel ya...I'm stuck in the 500-600 range on my practice tests and its sucks considering the amount of time I've spent studying for the last 4 months...ive put in about 20-40 hours a week - ya I have some free time

I take my test in a week, I'm not shooting for 700 or anything (at least not anymore considering how heartbreaking my practice scores have been). At this point, I'll be happy with a 600 something.

Anyway, it seems like your verbal is ok, so I'll comment on math...if I were to do anything different about how I used my study time...I would probably focus on looking at a range of problems from easy to difficult and solving them within 2-3 minutes. Don't waste your time trying to solve a math problem if you can't do it within 2-3 minutes.

If you can't solve some math problems in the OG, give up and look at the explanation of those questions you can't figure out...you'll be surprised at how easy it was to solve it if you just knew what they were asking for in the first place...

I think one valuable piece of advice that doesn't seem to be emphasized, is really try to intepret what the questions are asking you and conceptually how can you tweak your fundamental knowledge of math to solve the problem.

Also, after exhausting the OG, exhaust the GMAT Prep software if you can. You'll start to memorize questions out of the OG, so you'll need to shock your system with a set of new questions.