Lawrence
If your training has been as professional as it should have been then you should have no worries.Examiners,in my experience, do their best to put the student at ease.Mine certainly did even though he asked me to do another forced landing session after some more training.He soon spotted the weakness!If you have a weakness then do some more training.
Your instructors should be able to tell you if you're ready.They shouldn't let you go for it unless you are.If you are the type that becomes nervous during tests I'm sure they will disappear once you start flying.Mine did.