1. Practice makes perfect.
It's an obvious one, but you need to practice. If your driving instructor points out mistakes then ask how to improve and work on it. The driving and vehicle standards agency suggest that learners on average need at least 45 hours of professional training plus 22 hours of private practice. It's not mandatory that you need this many hours of practice, your driving instructor will be able to judge when they think you are ready.
2. Warm Up.
Make sure you practice before your test on the day, you could drive to the centre yourself before the appointment, it would be helpful that the occupant in the car with you can give you any last minute advice before your test.
Psychologically, you do need a small amount of stress in order to succeed, so don't relax too much but don't stress too much either. The more stressed you are, the more likely you are to make mistakes. DONT FORGET TO BREATHE GODDAMMIT.
4. Think positively.
Be positive, being negative can stress you out, being positive can prepare you for the best and the worst, whether if you pass or fail. Do yourself something before the test to cheer you up, treat yourself, go get yourself a Big Mac. (I don't know about you, but that would definitely help me)
5. Be comfortable in the car you're in.
Get to grips with the car and it's controls before you set off, get used to the biting point of the clutch and remember it, in order for your gear changes and moving off to be smoother and more steady.
6. Be prepared for anything.
Check what the weather will be like on the day of your test, you need to prepare for dry, wet or slippy, icy conditions dependant on what it will be like. Ask for advice from your relatives or driving instructor on how to deal with wet or icy conditions.
7. Know the route. Be road savvy.
Try and get to know your area, and where your most likely to drive, including main roads and motorways. It will be helpful to practice around the main areas to gather information, where potholes are, what signs are there etc, so your more confident on your test.
8. Don't be afraid to ask questions.
The examiners are harmless creatures, don't be afraid to ask them to repeat an instruction if you didn't hear or understand it.
9. Keep your eyes on the road.
Don't be distracted by the notes the examiner is writing down, you don't have to make eye contact with the examiner while driving either, just focus on the road, your driving and the instructions you are being given and you shall be just fine.
I hope these tips help you, as always if you have any more tips or questions, don't hesitate to comment below :)