You could start by being more positive. Your posts are all so negative. Remember that in life things are generally self fulfilling. If you think you are going to fail, you are setting yourself up to fail.
Your instructor must think you are capable of passing or he/she would not put you in for the test, so do him/her and yourself a favour by adopting a positive attitude before you start, and do what you have been trained to do.
The examiner is trying to pass you, not trying to fail you. You just have to have faith in yourself and your instructor.
Fly well, keep calm and carry on.