I used Barron's to prepare mine 4 years ago. The most difficult part for me was all the vocabulary in the verbal section (English is my second language) and I had a vocab book just for that. Quanti was easy if you have a good grasp of high school math. GRE analytical writing has a fixed pool of questions. If you don't have time to write out every essay (which I didn't), at least scan through all the questions and read some sample 6.0 essays provided by ETS to understand what they're looking for. Good luck, you can do this!!