The best of luck for the test mate.
1. Keep ahead of the a/c and all will be good.
2. If anything goes amiss - don't mention it! The examiner might have missed it.
3. If you start getting frustrated or gloomy - try and put it to the back of your mind and think about what a giggle flying can actually be.
4. Enjoy it.
Now if only I can put my own personal demons to bed I'd get back on the CPL course.........