For starters make sure you know where everything is located on the bike including switches, brake & clutch levers, starter, kill switch, etc. While riding the course stay focused on where you're going, block everything else out including the examiner. Before I took my riding test I went to the local DMV a couple of times and practiced on the test course in the rear parking lot. The course is painted on the blacktop which is great 'cause I needed the practice! Maybe your DMV has a similar set up???
In any case I wish you the best of luck.