I am going to approach this 3rd gmat from a completely and maybe too daring of an angle.
I attribute my lower score this time around to mental fatigue and overall gmat burnout.
The first test, I had done the following to prepare. About 30 hours of pre-prep class preparation, took a 5 day prep course, studied for just over a month on my own using OG11 and the prep class problems to review. I only found this forum about 3 weeks before my sept. 20th test, so I did not have time to review Sc1000s, or Challenges, which I probably should have because I am certain I would have achieved a score of closer to 700.
Honestly, I don't think I had prepared enough for my first exam. Gmatpreps I had never gotten over a 640.
After the first test, I was going to overprepare for the next test a little over a month later. I did sc1000 up to #500, did OG Verbal book and focused on verbal mostly. I did about 5 challenges and went over the OG11 Ds and PS throughly. I also did 2 gmatpreps and finally got a 700 on the last one.
I started this gmat process July 15th, and really didn't stop until Nov1st, when my 2nd test was. I didn't have much "real" job work to do, so I basically studied for a couple hours a day and leading up to the 1st and 2nd test, studied 2 weekends in a row.
My coworker saw this whole process take place, and said to me yest. "you burned out, this isn't a memorization test, and you should go cold turkey and take it in a month or two." He said he did a similar thing on his lsat. After a month off, everything he had studied had transfer to his subconscious, and when he took his test, he was well rested and could think much clearer.
The gmat is more than just using a formula to get an answer. This is what I was worried about taking time off, forgetting a formula or how to calculate a 30-60-90 triangle, but I think that b/c i have put enough time in I will remember these things, and using formulas is only a small part of the test.
So, I am going to do nothing gmat related for the next month and just work on my applications. I will review a few formulas and maybe do a a few OG problems before the test. We'll see what happens.