The dreaded course memorization, it's something all of us struggle with. My biggest advice is to visualize the course in your head. I've even heard friends that make a store out of it ex: butterfly oxer goes up into the cloud vertical.
This can help as well. For me I visualize the jumps and in my head put them all together in my course and kee running it.
Repeating it out loud a lot ALSO helps as it keeps your brain thinking about it "red oxer, blue vertical"
How this helps!