Most of the time, whenever you let them go, they go for the gate, unless yours is like my horse and stays in the back lol. Just make sure you or your helper person is prepared to shoo him from the gate, or make sure he keeps moving. Try to use the whole arena, and let him trot and canter, im sure his big trot will be pretty
Practice your catch and release. Some people pat their chest, croutch down and call them, whatever works for you, i corner them, but this isnt the best way to show the judges your bond with the horse haha. The less you move, the better, i think i got a lower score because me and my cousin were running too much. Oh, make sure you actually hear the music before letting go. I learned that the hard way, i got placed last because i let him go without music. If your music doesnt work, they may use someone else's music or you can try again at the end of the class, so they tell me dont know if that true
I saaw a girl stop in the midddle of a song because the song stopped in the middle. whatever happens, make sure the horse is still moving untill they call time. Thats all i can think of, oh, and if your horse has a problem of sniffing everything, but a little vicks on inner edge of their nostrils, they cant smell anything. Just make sure its not too too much
hope i could help