Relax, enjoy, and just do it properly.
If you pass, congratulate yourself and move on to the next phase of learning.
If you fail, accept that you need a wee bit more experience, and pass it next time, then move on to your next phase of learning. Would you really want the examiner to say that you have passed if you are not good enough?
Chances are, your instructor would not put you forward for test if you had not already demonstrated the ability to do it all to the required standard so I suspect that you'll be fine.
Let us know how it it works out.