Speaking Test

After one hour exactly I have a speaking test, well I'm really nervous about it and worried because I'm not good in communicating with TEACHERS because I always don't pick the right words. In real world I'm good in speaking but when I come to know its a test I get scared and nervous and I don't know what to say and screw up. sometimes it get to a point I want to scream and get out!
But in the end its my markes and if I ran away I will fail so i better be calm and take a deep breath and let it out and be sooo confertable and confident.
I'm going to take my test now wish me luck!!