Time management is absolutely key in taking any timed test. I had a huge jump from my initial practice test to my final LSAT score. The key for me was the "games" section. I think it is possible to improve in all sections, but the games and arguments sections generally leave the most room for improvement, since so many of us have our reading strategy already ingrained in our heads. Don't bank on a massive improvement, but shoot for a realistic goal. I know this sounds silly, but try getting your heart beat up before you take your practice tests. Anything you can do to simulate the real test situation is going to help. Good luck on your test!