Hi Ian.
I know it's easy for me to say, but try not to get stressed about the Test while you wait.
I think that most experienced pilots will admit that the more they learn about aviation, the more they realise how much they don't know!
If there's anything mentioned above that you don't know, then use the time before your test to fill in the gaps with your Instructor.
In the end though, only he/she can advise you if you are ready for the Test.
It's not in Instructors' interest to recommend people for Test who are not ready, as having their students fail tests reflects badly on them.
Examiners have to do tests themselves regularly, so they understand that it is a stressful time for the candidate, and your Examiner will do his/her best to put you at your ease.
Once again, I know it's easy for me to say, but just chill out, and give it your best!
MJ
