It's incredibly easy. After two weeks in my course, I obtained my permission to do the rest of the course as "independent study." I followed along at first, and though I'm not proud of it, I stopped doing everything for several months straight until about three or four days before the AP test. From there on I crammed everything I had missed for the next few days and ended up with a 5. If you can differentiate and integrate, you're pretty much set. I even left 1/3 blank on the calculator multiple choice section (I figured knowing where the integration key was was enough, but that sure wasn't true!) and one of the six short response questions completely blank. Easy test, AND a generous curve. (I guess I should add that even though I did well, half the people in the class still didn't pass. But this was an absolutely terrible teacher. A competent teacher will net you a passing grade easily.)