With the wealth of LSAT prep materials out there, it can be tough to find the best resources for LSAT study. I've been tutoring the LSAT for 5 years, and these are the materials I've found to be the most helpful.
The best way to practice is by using previously administered LSATs. LSAC has published several collections of tests:
The most recent tests (Volumes 4 and 5 above) are the most accurate reflections of what you'll see on test day, while the older tests can be significantly different. I recommend both taking fully-timed practice tests and completing solo sections for practice. Take the time to study these tests in depth and your score will improve dramatically.
For most students, the analytical reasoning section (colloquially known as logic games) is the most difficult part of the test. The PowerScore LSAT Logic Games Bible is the best resource available for learning how to break down and diagram most of the different types of games you'll see on the test. Thorough study of this book will lead to mastery of the games section, and my students have found it incredibly helpful.
PowerScore also publishes a Logical Reasoning Bible that covers that section of the test by breaking down the most common types of questions and how to approach them.