Yes, it is a group interview, but it really depends on how they divide you up. There were around 50-60 applicants present. First, I would recommend you bring a snack with you or grab one they have for the applicants (they had fruit and cookies). They let you mingle with other applicants and some students for a bit, then bring you into a room and the faculty gives a presentation on the program and their research interests. Then, half of the group goes on a tour of the campus while the other stays behind an interviews in small groups, and then the groups switch. The tour is your opportunity to ask the students any questions you have without any faculty being around. The students I spoke with were all super honest and welcoming. My interview was supposed to have three applicants, but one didn't come so there was another applicant and myself. We were interviewed by one student and one faculty member (may vary depending on your group). I honestly don't remember any of the questions, but they're only trying to get to know as us as people to see if we'd be a good fit for the program and fit in well with the other students. Their program seemed extremely tight knit to me, with no competition between the students. I know it's difficult, but don't stress about it. It's a long day, but it's a great opportunity to learn about the program and see if it's a good fit for you.