GMAT Strategy

Here are my scores so far

Date Source Total Quant Verbal
6/10/2011 GmatPrep 680 46 37
6/12/2011 Master GMAT 650-680 43-45 37-40
6/17/2011 Knewton 640 45 33
6/18/2011 Master GMAT 630-650 44-45 34-36
6/19/2011 Master GMAT 680-710 48-50 36-38
6/24/2011 MGMAT 670 46 35
6/25/2011 KAPLAN 620 42 36
6/26/2011 Master GMAT 650-680 44-45 37-40

I need to get at least 700. I have not practiced any AWA. I have done just the master gmat course so far. I have also done some grockit - mainly the targeted study plan section. I have just started doing the OG. I can spend a maximum of 2 hours in weekdays and 5-6 hours in the weekend. My test date is August 6th 2011. I would really appreciate any pointers.