I was sitting and thinking what made me add 50-60 points to my PP scores over pretty short time - 1.5 months (I could used one more month to improve my verbal since I felt I could improve more but oh well - that's one of the challenges of GMAT - to get ready within a limited period of time).
Continuous studying and doing hard new problems were probably factors
but another thing I can recall is I took it easy for 2-3 days before the test, some light reviews, that's it, eating well of course.
I took my last full practice Kaplan CAT test 5 days before the real thing, not 2 days like lots of people do.
I didn't sleep well. I had to take some sleeping pills which didn't work. I managed maybe 4 hours of good sleep before I had to wake up. I think what's importan is not how much you slept but whether you got at least few hours of real night sleep.
No red bullls or any stimulants of any kind during the test although I brought a red bull along. I had just one cup of coffee in the morning.