Guys,
I studied for a month and took a CAT from PR. I scored a 490. I then took one of the Kaplan tests and scored a 550 or 560. I then took another PR and scored a 480. It made me angry. Then, I decided to attack my weaknesses: word problems translation and number properties.
I studied like this for a month. Took the PowerPrep test and got a 600. Then, I took each GMATPrep twice after another 3 weeks of studying and got a 640. Then a 610, 580 (very nervous), and a 630.
So, look at it this way: I went from 490 to 640 in 3 months. My highest quant and verbal scores were 41 each.
My studying habits are as follows:
2 hours a night Monday through Thursday. About 4 hours on Friday (this includes reviewing all of my flashcards). Saturdays: I used to study every Saturday for about 8 hours, then cut it down to 5, as I saw that going over 5 or 6 hours was counterproductive. Now, I take a CAT every Saturday, then review the questions, which is still about 7 hours of studying.
My exam is scheduled for the 18th of July. Until then, I plan to take a CAT every weekend (MGMAT with GMATPrep the week of my exam). On weekdays, I plan to continue my 2 hours M-Th and 3 or 4 on Fri.
I think the key is not to overheat. If you feel like you are not really thinking about the material before you, just close the book and go do something else. Hit books when you are actually able to understand what you are reading. There are days when I get home from work absolutely fried. On days like these, I just hit the weights, and then sit back with a movie or a newspaper.