I've been using Target Test Prep for about 3 months and it has been amazing. The course gives a basic breakdown of all of the concepts, along with numerous practice problems check comprehension. The only negative (if you call it a negative) thing about the course is it's length. I started off casually doing the program in march, but after picking up speed in April I am still not through it. I have started doing practice tests without fully completing the course. Nevertheless, I think it is great! Scott and Jeff have also been great and have been quick to respond with questions about the program. I would definitely recommend.