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!!