Sweaty hands, nervous fluttering and then a total blackout - the driving tests are an exceptional situation for many young people. But there are ways to protect oneself from the fear of examination and its consequences. What they are; you can find them here.
It's like hell: you passed the exam simulations at home on your PC with flying colors and in the theory exam you are totally on the line. Just perfectly parked during the driving hours and stalled the engine with the inspector on board. Exam fear is a particularly nasty spectre, because it leads to the fact that one is no longer able to recall its existing ability. Reason enough to take a closer look at the phenomenon.