Hi Daniel.z
I did the interview for year 10 entry last year (There were 4 other people with me), they first started off with an icebreaker, we were split into groups and had to make a paper aeroplane that would travel the furthest. It wasn't about who won but about how we communicated with our team members when we made it. Then we all sat together including the principal, assistant principal and a maths teacher, we talked about current world issues and how we could fix it. (Like global warming/Assault). Then they gave us the questions we were supposed to answer in the one on one interview like 20 mins before so we could prepare. The questions were like... One of the values of SCHS is ... how do you represent this? What do you do outside of school and what are your hobbies? Why should we give you a spot? They asked only about 3-4 questions like this so don't worry!
All the best with your interview!