I passed the exam. Well, you are usually informed to prepare four lectures.
If you apply for a language, prepare four drafts of junior high school Chinese handouts, which can start with any words. Read the lecture notes carefully, and then the teacher will tell you one of them. You can speak fluently and clearly. In addition, I will ask you some questions, such as how to be a good class teacher, and maybe I will ask you some Chinese knowledge, all of which are very simple.
We didn't ask at the time. I applied for mathematics, and only prepared the content of Grade One.
The whole process will not take more than ten minutes. It's simple.