1.Smile at the audition. (Give them friendly vibe and be confident.)
2.Do your best. (You have to give all your best. )
3. If you are audition for singing but if they ask for dancing. Give it a go.
4. You can to try instruments too. If you are a kpop star, knowing how to play instrument is great.
5.Be yourself. Be positive.
(I want to say that this is not a easy task. Even if you become trainee, you have to go through a lot of hardship. This is a big choice. But go for it if you are really serious about music and all those stuffs.)