First time failure and nervous

Why ? I cannot do well in my muet speaking test ??? It is a great compassion for me . I cannot accept the failure .
Ok ....Lets fresh back ......
At the moment , teacher called out my name . I have no any preparation and i am in the holiday mode already . So , no choice . Need to follow the instruction . I know i always lack of confident and i try to relax myself . It did not brings any effect for me in fact it makes me more scare and nervous . ....
I have no experince to face this kind of situaion . I was a candidate A and normally the person who be candidate A will fell more nervous . The topic is How the public transport can be improve-punctual . It is a easy topic but i have point on that ....my mind is blank .....and at last i give up ......Why???? I give up so easily !!!!
I want to success ................. No more failure , no more nervous only have confidence ..