If your school offers seminars on how to take a law school exam, go to them.
I wholeheartedly disagree. I think that seminars on exam-taking could be the most worthless and forgettable part of my 1L experience. Much like CSOs' fora, "seminars" on exams offer nothing of import to anyone. General advice, like budget your time, is usually tossed around. Other than that, there isn't more than a granule of useful material.
If you take practice tests and study the material, there is no need to do anything more. At some point ("diminishing returns"), you will be wasting time studying--you will inevitably do this, but your goal should be to minimize the amount of time you waste. That said, you should still study hard. Just remember that no matter what you do, the intimidation of taking an exam will probably play a role in your performance as well. The more confident you feel about the professor's exams and your grasp of the material, the better chance you have of "keeping a level head" and performing as best you can. Trite advice, I know, but it's definitely truthfully.