If ATP's written prep computer program is anything like it was a couple years ago, you'll be wishing you learned it while sitting on your couch. The system was kind of archaic. Not to mention, your brain might be fried after the 8 hour cram session anyways; taking the test afterwords would suck. IMHO, you would have to do some pre-study before doing the 8 hour session it at ATP, being that you'll have to ante-up the testing fee again if it so happens you need to re-test. It's been completed before though, and will be done again by many. I just personally wouldn't, after hearing some of the choice words a few people had during the crunch period.