As cliche as it sounds, just be your self. The interview was very laid back. It's a group interview, so you will be with 3-4 other people and have 2 interviewers. In my case, the interviewers would ask us a question, then we went around and gave our response to the question. Just try to give your own, unique response, which was sometimes hard if you are the last one to answer the question. No super intense questions (at least in my case), just make sure you have sound reasoning for why you want to be a PA, and make sure you're knowledgable about both the pros and cons of the profession.