i did this acting course, it was mainly about what happens at auditions, how to act...etc. and the guy whow as teaching the course, runs a casting agency, he said the best advice I can give you to make that day a day out, threat yourself to something on that day, then go in do the audition and don't thinki about getting it or not getting it, just do your best job. If you get worried or put too much thought into it you will not perfom as well.
This relaxed attitude does work, I found that most of the interviews I go for I treat them like friendly chats. Its a bit of fun.
Best of luck with it
got hips like cinderella must be having a good shame talking sweet about nothing
cookie i think you're tame" The Pixies