Although others have said try different bikes, just to add -- Try other bikes on the first day, but on the second (test day), try to stick with the one you like best, and get very comfortable with it for the test.
As for the test itself, it wasn't that hard, skills-wise. The hardest part I had with it was the chalk lines they use to mark lanes is fairly dull, so I found it a little hard to tell if I was inside the marked 'lane' or not (sometimes). I also suggest when they let you practice the test beforehand (they give you 20-30 minutes), try to visit as many test stations as you can. I got stuck at one of them I was having minor issues with, and as a result I never got to practice the other sections/components before test time (although I still passed).
Also as others have said, your actual M1 paper (green government paper license) is required for ALL THREE dates -- theory class, practical day 1, and practical day 2. When I got mine, I put it in my riding jacket so there was no way I could lose it. If you have lost yours, definitely get another one before your course date.