I just walk the course, then sit there and trace it in the air with my finger, then when I watch other riders, I think ahead where they are supposed to go, and then I see them doing it and I know its right!! :)
With your finger , remake the course on the floor , with your eyes closes . And , on the course , during the jump , think now for the next jump . But it's sometimes problem when you begin do jump . I remember , for my first course , I have the same problem and I jump the wrong jump xP
With a bit of exercises , you'll can do make a clear course! . I think , if you can , work the jumping course at home ! :) Good luck !!!
Save the course to your phone, ipod, print it out, study it whenever possible before you go into the arena. If you get the course the day before, do the same thing, and memorize it backwards and forwards.