I have never been so nervous in my life, upon walking into the waiting room for my driving test. I was only there for a minute, though I had a totally break down of sorts. I wasn't sure I could walk to the car, let alone drive.
Also don't do what I did and take off without your seatbelt on. Luckily the instructor himself didn't even notice, presumably because the error was so large. I just indicated to pull over and he asked what I was doing. I told him what I had done and he said, don't worry, calm down and we'll take it from here.
Later on in the test, when we were on some quiet roads, he told me the usual, right before the end of this road I am going to ask you to preform an emergency stop. The signal will be, e.t.c. e.t.c. We got to the end of the road, please turn right, hmm, no emergency stop, waited along the next road, still no signal for the manouvre. By a couple more turns, I guessed we were not going to do one.
Back at the depo I was quite amazed to find I had passed. Woohoo.
All the very best for your test, try to relax and put your seatbelt on.