My advice would be to practice the most-asked questions that are almost 100% likely to come up. Questions such as "Why medicine?", "Why UIC?", and be able to talk about your personal statement and secondary essays. Other than that, anything goes and it's impossible to predict so just take it easy 🙂 I'm not sure about everyone else's experiences, but for myself, my interviews were all very relaxed and they all tried to make me comfortable. They're definitely not out to get you or trip you up - they just want to understand you as a person and see your paper application come to life. Hope that helps!