Started studying for this test in November of 2010. Original GMAC practice score of 450. Studied all the
MGMAT books and Kaplan800.
(6/18/2011) 680 42q 41v
(11/2/2011) 620 37q 37v
(12/3/2011) 680 44q 39v
(1/6/2012) 740 46q 46v
The lesson I learned is that it's better to be relaxed than overcaffeinated. The 620 was one of the worst experiences of my life, two frappucinos and a 5 hour energy, I almost had a panic attack. My hands were dripping in sweat. In hindsight, I should have cancelled those scores- but pride's a #$%@.
For the final test, I didn't look at a GMAC practice test, just redid the questions in the OG reviews over and over. If you do this, you'll start to see the patterns in the questions, especially DS, and you become adept at guessing. I recommend Kap800's critical reasoning section as well. And doing as many official SC questions as possible- over, and over, and over.
Took the test, jetlagged from a 12 hr flight in from Africa, no caffeine, powered through- bam!
I was shocked to say the least, just hoping for a 700.
Preparation and relaxation I'd say are key.