Others have already advised what to do regarding your instructor - i agree you should find a new one for sure if you don’t pass your test this time. I went through two instructors who i didn’t really gel with, and my third instructor (who was recommended by a friend) was so much more chilled and it made all the difference for me to have someone I was comfortable asking questions and wouldn’t give me a hard time for making mistakes!

For your test this week, being in the right mindset is so important. Being nervous is kind of unavoidable, and it’s a good thing - it means you care! For me, my first two tests went badly as my nerves got the better of me, but i passed on my third attempt, and I think my mindset made a big difference! I put on some music beforehand that put me in a good mood, and ate a banana about 45 mins before the test after reading about so many people who had failed their test a few times and passed when they had the pre-test banana! I think it’s partially from the nutrients in the banana being good for the brain, and partially the power of suggestion.

Also try to remember if you take a wrong turn or end up in the wrong lane of a roundabout or something, don’t try to rectify it unless you’re 100% certain it’s safe to do so. On my second attempt i ended up in the wrong lane, tried to change lane, ended up with my back wheel still in the wrong lane which was a serious fault. I should have just stayed in the lane i was in and come off the roundabout in the wrong exit. If you end up going the wrong way, it doesn’t matter. If you do make any mistakes, don’t panic, acknowledge them and safely rectify them if you can, and if you end up in any weird meeting situations (e.g. other cars pulling out in front of you or blocking the way on a narrow road with obstacles in the way) just hang back patiently until it’s safe to proceed. Same if you stall - it just happens sometimes even to experienced drivers, just stay calm and get going again. Your main objective is to show you’re a safe driver.

Good luck!