Some more general stuff....
Remember that the main thing the examiner is looking for is safety. It doesn't matter too much if your flying isn't perfect, as long as it's all done in a safe and legal way. If you're asked to do a maneuver and you're not happy with how it went, say so, and you'll probably be just asked to do another one.
Also, remember to prioritise: Aviate, Navigate, Communicate. Especially around busy periods like the diversion point or PFL. The main thing to do is to keep flying the plane safely, and remember to keep a good lookout going!
Good luck! Just like the other guys have said, you're only put for the test by your instructor when you're ready.