What helped me out tremendously was conducting several practice jumps a couple of weekends before the course started. I made these jumps with an evaluator that I knew was going to be evaluating during the course. I also got intimately familiar with the air evaluation checklist in the IRM. It lists the areas in which you will be avaluated in the air. You need to score 75% or better in order to pass the air eval. Also, get the bottom end sequence down cold(altitude signal, pull signal, dock, assist, deploy student).
Good luck!!