He's not there to fail you
It might not be a 'he'! I had a lovely slim blonde, Hi Francis, and what an impression I made, playing it cool then barfing half hour into the test!
They are not there to fail you though, I made several mistakes but corrected them, reamined safe, and passed.
The examiners know people will have a touch of nerves on the day and you will be surprised how relaxed the flight will be. Examiners are normal people to you know
If you make a mistake, dont let it play on your mind as this will distract you from what you should be focussing on, sounds like you have had some good practice so far this year and you wont come across anything in the test you aint seen before.
Good luck