WAY easier said than done. This is why people struggle so much with interviews. The best advice I can give is to know your application and have answers for the "stock" questions. Like someone said before me relate stories to your answers. For example in every interview I got asked "why dentistry?"-- I replied with the same answer every time (obviously not word for word but the same principle). I love to serve others, I would relate a service trip I went on recently and how it opened my eyes to the opportunity that dentists have to serve in underserved areas. Easy--dont over think things either. My first interview I was so rehearsed and when I got in my interview I went blank (got wait listed). Next 3 interviews I just decided that I wasn't even going to rehearse. I looked over the interview feedback. Answered them one time in my head and didn't look again. (got in to all 3)