Most LSAT prep books have some things they explain well, and other things that they confuse to all...
Go to your local library and check-out all the LSAT Prep books you can carry.
Scan the books and pick-up their nuggets of wisdom, and forget the rest.
Also, buy the Official Past PrepTests with Comparative Reading, like Micdiddy suggested, and practice practice practice.
If you find that you can't understand a specific question or question-type, post your question on this forum (not TLS), and I'm sure someone nice will help.
You can also hire an LSAT Tutor or enroll in LSAT classes specific to your LSAT weakness.
Just make sure not to get stuck trying to learn and master techniques that may not work for you.
Best of luck.