As is standard, you introduce yourself and mention your experience, if you have any. A few questions such and then you move on to the demo which lasts 15 minutes. In the demo lesson, they expect you to already know the manner in which you should conduct the class, like have props, toys and such, play them intro songs, youtube videos, know tpr (total physical response), etc.

It is quite easy, and the interviewers are really helpful. The questions are typical interview questions, for which you can find answers online if you only do a bit o research.