You must master the knowledge of the work that you're striving to get it. Not a few people doing a job but he did not understand, then the result that person would not be comfortable in working and in the end he was unemployed again.
Not from content you work only to be prepared in an interview, your appearance should be convincing and certainly neat, is not excessive. Have you nervous?, of course everyone, initially had nervous. To eliminate the nervous, the first thing to do is sleep or rest before the interview, it will restore your stamina.
"The most important thing in an interview is confident. Tell yourself that, I is awesome."
I hope, this interview tips is useful, for you.