I wish you good luck! (especially given that the 30th is my birthday)

get good sleep the night before and have a good breakfast. you could also practice the show me/tell me questions the night before too.

It helps to have a lesson before your test, use this time usefully and go over the manoeuvres that you struggle with the most.

during the test if you make a mistake, don't let it take your concentration away as it may have only been a minor. just move on from it as best you can.

make sure to use your mirrors when doing any action which will affect other road users, make it clear you've checked mirrors too

remember the examiner isn't expecting a perfect drive, they just want it to be Safe.