I like watering down the arena, and then dragging the pattern in the sand, with like... a stick behind me as I walk. Then I stand at one end of the arena, pointing my way around and saying it out loud. Everyone at the barn has gotten used to me doing things like this. ^.^
I also "ride" through the test in my head at school when I'm bored. I'll be sitting in my seat, hands held as if I have reins, shifting my seatbones and so on; apparently my classmates find it entertaining. xD
One other thing I love doing... if you have the EquiStar horse game for PC, or any other horse game, [I don't know what else is out there!] I just ignore the set pattern that is on the screen, and "ride" my virtu-pony through MY test, not the PSG or GP test on the screen. =] I find that that helps a lot.