I teach MCAT physical sciences for them. The pay is very good, and it is not too time consuming. Really, the time goes into training and preparing for your first set of classes. I trained in Boston, had a great time, met a cool bunch of people, and checked out Harvard Med in the process (quickly found it it was the absolute best there is in person, ie best town, facilities, campus, and the hardest to get into). The preparation for my first set of classes was long, but I am teaching two sets of classes now at once, and it is easy since I have prepared so much already. Teaching is a lot of fun and makes for great supplemental income. My TPR wages from this summer's MCAT paid for my applications. Now I am just saving the money for next year when I am in medical school. Go for it, you need good test scores, but if you have those and want to have fun then you should be fine.