At medical school interviews, they are looking for two things. Will you be a good doctor, and will you be a good student. The qualities of both of these individuals often overlaps, and one of the ways to stand out (in a good way!) at interview is to clearly display these. Make sure that you are friendly and open - many of you will already have these characteristics intrinsically, it is just a question of making sure that they are shown to the interviewers. Confidence in yourself and your answers is a great way to stand out at interview. If you feel that this is one of the areas that you lack, interview tutoring and the practice that it brings may be a good option for you.