I did the testmasters full course for the September LSAT. It really did improve things for me. I did the online course, but they still sent all the books you would get in the course if you went to take it in person. It came with 50 full LSAT tests along with books that did give the correct answers, and also explanations for the answers. there were like 12 lessons tat were like 45 minutes or so each, i believe. you can watch them as much as you want. it was like $1000 for the course, but in the end i think it was worth it. look into it.
I am pretty sure this is not the same testmasters course that most people on these boards commonly recommend. There are actually two "Testmasters," one at testmasters.net and the other at testmasters.com. I took the .net one for the September test. It was really helpful. I don't know much about the .com one.