Okay, I took the full kaplan course, and I really really regret it. What a waste of money. If you can read, just buy the books; it's much cheaper, and what the course amounts to is someone reading you from the books (sometimes correctly, sometimes incorrectly). I think the only helpful thing was having proctored tests; however, they would only grade my written portion twice, and for one I recieved no comments and it was returned 2 days before the actual MCAT. As well, I don't know if anyone else has found this, but I think the grading of their proctored exams is a little iffy- I think they inflate your grades at the end to make you think you're improving. On the last exam I took with them, I arrived 45 minutes late for the first section, left significantly early after falling asleep during the other two. I hadn't done any studying since the last time I took it and I improved 4 points, or something ridiculous like that.
The most helpful thing I would suggest would be to get the AAMC practice items- tests and passages.
Good luck.