Bummed with 680 in GMATPrep2

After a 730 in GMATPrep1 last month, I thought it can only get better. But somehow I ended up with a 680 on Saturday in the GMATPrep2.
It could be because I took the AWAfor the first time before the test. Should I practice all tests with AWA?

I am taking the test this Friday, Sept 11th. Dont ask me why I chose that date, I didnt have a choice.

Anyway, now I have almost given up on 700. I have gotten above 700 only twice in all my practice tests, GMATPrep1 and MGMAT6 - 710.

GMATPrep2 - split is 49/34. I have made some silly mistakes in verbal but I did find CR very hard and RC very very dry. I can survive if I get science RC passages, but economics and history passages really turn me off and divert my concentration. I am now working on LSAT passages for 1000RCs to see if I can improve my speed a little bit. Also working on CR and SC.
Quants I am not getting over 49, I should give up expecting 50 I guess. I worked on about 17GMATClub tests averaging only 26.

I suppose the real thing would be +/- 30 of the Prep tests, so I am expecting something between 650 and 710.

Is 650 enough to get into part time program in Haas? I have 6 years experience plus a Masters degree. I have some unofficial management experience, but am in a highly technical field.

Also please suggest what I should do the remaining 3 days.

Your responses are much appreciated!