First time in my life

I feel very nervous in this momment. I'm going to attend an interview session tomorrow but right now, my nervous is getting stonger and has conquered my body. I can't sleep well and so scare of what I will say during the interview. I'm very good when dealing with my friends and teachers but this time, it's the JPA staffs. I don't know what can I do to keep the nervous away but what I must do now is think of what I have to say soon. I have prepared it well physically but not mentally. I don't what will happen tomorrow but I hope everything will get fine soon.