Obviously memorize the skill sheets from start to finish, and practice.
Before you begin a station, ask to check your equipment and make sure you're familiar with everything...in the unlikely event theres something they are using that you're not familiar with, for instance spider straps for a spine board, make sure you tell the person testing you this BEFORE you begin.
Go to youtube and do a search for DCMT....that will give you examples of each station that are pretty well done.
Also, it will probably help to verbalize everything you're doing to the person grading you, even in stations like spinal immobilzation or traction splinting.
Good luck and don't sweat it.