don't ever say i don't know to a question, thats wat someone told me i think it was my counsellor hahha. don't be nervous. give eye contact. that is a must. have a firm hand shake. don't look up or down or roll your eyes i guess ahha and just stay calm and relax and try to have fun as well be urself. and try to make small talk, so they think that you are easy going and will fit in well.