ouch. well, i took the kaplan course and improved my score 10 points from my first diagnostic to the actual test. and shortly after taking the test, i "interviewed" for a job (they actually call it an "audition", where you get up and teach on a particular subject for five minutes.)
to address aliendroid's point, the instructions for the audition clearly state that you are to teach a "non-academic" subject - that is, not science or math, but rather something simple. the idea is that they assume your score will demonstrate your mastery of the subject matter, while the audition is just to show how you conduct yourself in front of a group of people and how clearly you can present material. the audition topics for the group of people who were hired along with me included: how a toilet works, how to deal with a mistake on your phone bill, how to set a table for a dinner party, how to talk to the media, and how to take your pulse.
and to answer someone else, to teach any test, you have to have scored higher than 90th percentile in the last five years. on the mcat, that's about 33 - 11's across the board.
by the way, i do agree that the TEL (the teaching edition of the lesson plan) is a bit rigid, but they've figured out what works apparently.