Mine were pretty average. 29 Mcat 3.8 gpa(both). Extra curriculars were just volunteering at local ER, food pantry, shadowing, and some more volunteer hours through honors organization at my university. They straight up told me my letters from my previous employer (of 5 years) and 3 science and 1 non science professor were phenomenal. I also did very poorly on my first MCAT and significantly improved so my interviewer said he really liked someone who knew how to fail at something and turn it all around if they want it. Shows drive, etc.
The Interview is just a social. Be honest and be on your best. Was even time to talk about my hobbies and enjoy the half hour. Don't worry about prepping just know the major questions and you'll find it easy to talk to them.
