Always pay attention to the candidates around you and you will get a lot of information.
After the draw, there is half an hour to prepare. The lecture time is 10- 15 minutes, and some courses require a little longer time, but it will not exceed 20 minutes. Say politely to the judges and teachers after class: Class is over. When the judges ask questions, some local judges will ask questions, and some will not ask questions.
It's easy to say, class is very simple, don't be nervous.