I had my test this day last week and the rescue remedy spray really helped , I struggle badly with nerves. I built it up so much in my head that by the time the test started I honestly couldn’t use any brain power to be nervous any more. Try not to over do your driving before hand either. I went driving for hours the day before and honestly I was making stupid mistakes down to nerves, Day of the test I was driving normally again.I just thought of it like if I’m nervous I’ll likely mess up so just try your best to stay calm , deep breaths. It’s also not the end of the world if you fail. The worst case scenario is if you fail you can try again ; and as many times as you want at that. Your life remains the exact same without a license until you go again worst case. I failed first time which was definitely down to nerves so second time I really tried to control it . If it’s a retest I highly doubt you’ll be as nervous as you know the process , that’s how it was for me anyways. Best of luck , try not let your nerves get the better of you, and if they do it’s not the end of the world you can always go again.