If you want the best, this is the place you should go. The teachers actually know how to teach, and they know that it has to be interesting if you're going to get it. You have to drive to their office, and they are a little more expensive than other tutors in the area, but they are worth it. They are open late, until 9 or 10 at night - because they work with college students - handy for test nights! They do other stuff like SAT classes and study parties during finals week.
Pros: best teachers, big improvement, open late
Cons: travel to them, a little more money