The GMAC guys have a great resource for the AWA. You get to write four essays and them critiqued. Since the source is the official test maker, my guess is, you'll get a good idea on how you'd score and how well you should prepare. 50IR questions should be about enough. The Critical Reasoning you use...

I strongly recommend switching from Kaplan to Manhattan for your quants. I began my review using the Kaplan books - and throughout, I felt that their quantitative review lacked substance. There are some good points, but there really isn't anything you can learn in Kaplan apart from "the kaplan ...