Arrive early so that you're not stressing about parking.  I was lucky to find a parking space after taking 3 trips around the parking lot.  Don't make the same mistake I did.  Give yourself plenty of time before the exam.

Relax. 

Preparation:

-rita book (good for establishing fundamentals)

-pmstudy practcie exams - I was scoring in the mid 60's on the first two, and this had me concerned.

-The exam simulator that was posted in this thread: