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I recently decided to go to law school. I'm not planning on taking the LSAT until June '11, but I did a diagnostic last week and got a 162. I really want to score in the mid-170's on the test, but I don't know if its too early to start studying.

What's the burn-out factor for LSAT studying? Would starting now be to early? If not, what are some good ways to prepare besides the bibles and PTs?

You do not want to delve into the actual material yet. However there are things you can do.
1) Pick up a book or two on informal logic. Search this forum, books are recommended.
2) Start reading dense material, such as The Economist,Scientific American, and Smithsonian. Think about the author's main points.
3) Sign up for a Logic Course at your undergraduate institution.