greenandwise,
you get access buy handing kaplan loads of cash. i didn't have time to do enough research on test prep alternatives so i just went to kaplan....but honestly i think this website is way better than kaplan's classes.
the CD tests are probably similar to their online tests.
btw...i know u didn't ask me. but i don't always do the AWA. i only do it when i think it's a question that "bores" me because it really tests my ability to squeeze an essay out.
another thing you can do is go to the final section of OG, read through all the AWA questions, pick the ones that you find challenging and practice drafting outlines. time yourself.