The key to doing well on the LSAT is working through real prep tests- especially the more recent tests. There is one free prep test available: http://www.lsac.org/docs/default-source/jd-docs/sampleptjune.pdf
Aside from the free prep test, there are 80 or so prep tests available for purchase. Many of these are available in books of ten tests published by LSAC, which are generally between $20-$25 on Amazon.
Before you write in any of the tests that you buy, make sure to make copies of the logic games. This is because it is really helpful to redo games that you’ve already done, especially if you don’t have your previous work and answers right in front of you.
[This page is currently being revamped. Stay tuned for more LSAT advice coming soon!]