7 days to go for the Big Day

Do what you can, but don't overextend yourself right before the test. Make sure to take one or two days off right before the GMAT to stay fresh and energized. Many make the mistake of doing way too much right before the exam. Please don't succumb to this temptation. Stay in control.

Your quant is pretty solid, but I'm not sure whether going over OG material for math is the best method (assuming that you have successfully completed OG Quant and OG 12 already). Look into Jeff Sackmann's Extreme Challenge math set. At 25 dollars, it's not cheap. But it's an excellent source for upper-level math problems and explanations. You still have time to finish it.

The most points for you will come from verbal, since there's more room for improvement. There's not much time left, though, so just focus on your weakest points. For your weak areas, review the OG questions (and answers) and re-read and brush up on specific sections in the guidebooks