Hi, I have a job interview on Saturday for best buy to become a retail salesman. Problem is I am way too nervous, for instance during the phone interview I was panicking like a maniac i was out of breathe and my heart was pumping intensely (This only happens with interviews). I really need this job since i am in alot of debt can anyone help me out with some great advice on how to ace this interview and start my job?

Im 21 and go to college studying computer networking. I'm very good with technology but no job related experience except for being a cashier/server at a restaurant. I've been to many job interviews but failed.