You will find a useful discussion on Kaplan in the "horror stories" section of this board. Here is a link: http://www.lawschooldiscussion.org/prelaw/index.php/topic,328.0
It's called "LSAT TAKERS! DO NOT USE KAPLAN"
I'm no fan of Kaplan because I think they burn you out just before the test. I think what they teach is useful. I would caution you to be sure that you aren't tired of the same question over and over, because that is what the LSAT is.
Whether you improve your LSAT skills in a class, one-on-one, or on your own, just be sure you are fresh for the LSAT that counts.
Kaplan's intense rigour in the 6 weeks leading up to the LSAT, including 3 full practive exams the week before the LSAT burned me out. I just couldn't stomache another LSAT question the day of my real LSAT. I did poorly. I didn't practice/review at all for my retake and I scored a modest 161 (85th percentile).