I recommend getting your hands on as many of the 50s series for the LSAT preparation. Test 55 was recently released by LSAC, but it had not been before I sat for the December 2008 LSAT. These tests can also be aquired on the LSAC site for a fee; however, I utilized Amazon.com in the crunch in that I needed some additional practice tests to continue doing timed tests prior to the real one. Frankly, I didn't think I could count on LSAC to get the tests to me in time and Amazon got them to me overnight (I had... more info