I took it 4 years ago and it is a mutha. If I were you buy the Kaplan test books for LSAT and go online and download old tests. Just practice baby practice. It has six sections: 2 sections of logical reasoning (LR), 1 reading comp (RC), 1 logic games (LG), 1 unscored section which will mimic other sections but you won't know which one is the one, and finally a writing sample.
LR is a series of arguments presented then you are asked to find the argument's assumption, an alternate conclusion, logical omissions or errors in the argument, to choose another argument with parallel reasoning, or to identify a statement that would either weaken or strengthen the argument. Logic class should give you the basic tools to answer these questions.
RC is pretty straightforward. 4 passages of about 500 words and you are asked questions about the passages.
LG are the ass kickers. You are given a setup and some rules governing the situation. Then you are asked to deduce aspects of the setup. Only by doing them do you get better. Bookstores and supermarkets sell logic games puzzle books that are similar to these as well as the Kaplan workbooks. Your mind must be trained to detect omissions, false assumptions, gaps in logic, and patterns.
The writing sample is not scored but copied and sent to law schools. Some law schools don't even use it. But if law school is in your future, dusting off the old writing skills wouldn't be a bad idea. Only English post-grads write more than law school students.
In case you are wondering I scored a 153 which is not bad. I decided not to go to law school because of the ethical minefields. I hope this helps. Hit me back if you have more questions.
TS