Hmmm. Thoughts on teaching MCAT test prep?

So has anyone taught for a MCAT prep course before, and if so, is it worth it? How much time does it require to prep for the sessions? I am just supposed to be teaching bio right now so I think I know the material pretty well, but I'm wondering about all the other class specific stuff that comes along with it. Is this an appropriate job/time commitment for a 2nd year med student??