Get to know your future interests, why you want to work with kids, past courses, and future goals. Work-study vs Volunteer, hypothetical scenarios regarding speaking to parents about child's development and how to encourage children.

I sat through an interview with one of the site managers just going through my experience with children and what I was hoping ti get out the experience. I also had to do a reading demonstration which was a bit nerve wracking, but went well. They will help you improve.