I took it long back from now but i have recently helped one of my friends and she made relatively decent score on her GRE last month with less than one month of preparation. She studied Kaplan's vocabulary workout book (especially for Verbal and analytical writing section) as well as Kaplan’s general GRE test of course Barron’s GRE general text book, these three books would be adequate for most of the students though it depends upon amount of knowledge one has acquired in English and Math throughout his/her academic carrier. Some advices: 1. First take GRE test from GRE POWERPREP software made available free by ETS to evaluate yourself so that you can guess the level of preparation that you need. 2. Go through each word list from Barrons and skim and skip the words that you are familiar with and make flash cards of words that you get confused or don’t know. 3. For math, its pretty easy (that’s what most of the students say) review barrons math review and also from the Kaplan’s 100 tips/review or something that on math. And practice some exercise in barons and other books. I guess that may be sufficient to get a score of 700 and above! 4. Practice GRE tests as much as possible. You will be pretty done and hopefully get a decent score in the real test Good Luck and if you needed any specific suggestions feel free to write to me.