I used to be an interviewer for high school teacher qualification certificate, and I also have this level. It usually takes about 20 minutes.
You can understand it as a trial lecture.
Prepare lessons carefully, then follow the crowd and treat the following judges as students, perhaps psychologically calm.
Note: The judges may ask you why you design the course like this, why you design the questions like this, what is the theoretical basis of the design, and so on.