I usually just draw the course in the air with my fingers 🙄.
During the lesson while I am riding I walk the course with my horse. Then ride to the entrance of the arena and stay there while drawing the course with my fingers in the air and counting the jumps. For example:
(1) green ;then turn left (2)red; then diagonal (3)blue ; then turn right ... etc..
I say it loud and draw the course with the finger and follow the track that I would ride.
I've found that I really need to visualize what the course is going to look like while I'm riding it, seeing it from the directions that you'll see it when you ride. And repeats repeat, repeat. Good luckN
Remember the colours of the jumps! I find that relaly helps being one is an oxer with the orange dazzle board and 2 is the sailing boats etc. also think of it as a dressage test, where your entry and exit will be and maybe say the jump number a short you go over it. Also look at the next jump while you are over the top of the previous one eg going over 5 and look left to jump 6 so your horse gets the right lead and knows where you're going
There is one called jump off. You can put in different kinds of jumps and can simulate it I'm pretty sure. However, I will say I don't have it personally but have been thinking about getting it.
Walk the course and look for landmarks, plan to arrive at your class early so that you can go over the course last-minute with your trainer, and visualize. You can also draw the course/ take a picture of the course map so that you can study it at your trailer. Go over it until you have the course memorized🙂 Hope this helps
Go over them with your trainer. If you have a white board or chalk board (paper works too) write down the course and go over it over and over. Then set up objects in a large room where the jumps would be. You can kinda walk through the "jumps" and visualize what your ride is going to be like.