Each centre tends to set their own test so get in touch with where your going for exact test.
20m circles changes of rein serpentines all usual prelim movements! Without the canter
The Pony Club have a walk and trot test that some centres use. If it is that one you can down load it free from the pony club web site. good luck and enjoy it.
I'm doing one next week as well and it's really simple. Trot, 2 x 1/2 20m circles, 2 x 10m circles to change the rein, WLFR etc. Contact the organisers.