Buy at least one LSAT test prep book that provides strategies for solving problems quickly. These help
everyone preparing for the LSAT.
When selecting a test prep book, be aware that the LSAT modified the reading comprehension section a few years ago so be
sure to get a new edition. There used to be a single passage with questions. Now, there is a comparative reading section which has two passages and one set of questions.
Older books have the old style test for this section.
I do not pretend to keep up with the latest LSAT test prep books. Below is a quick look at the leading books on Amazon.
This list is always up-to-date. This page on my site has more books and detail.
Be sure to read the reviews. They can be incredibly helpful in weeding out the marginal books and helping find the best ones.