nervous make me weak

today is the last class for netball class and today we will have test. I really hate myself because I get shaking during the test and it is effect my performance. I really hate it..Why I'm get shaking with this small matter?? I doubt why I cannot control my nervous. And I am regret one thing when my partner cannot perform well because her performance will effect me too since she is my partner. but I think just ignore it since we are friends...