When preparing, prepare the general framework of the lecture, memorize it, and then add it to your big framework according to the specific knowledge of each unit.
The process is to draw lots to decide the order of lectures, and prepare in the preparation room. It's your turn. Someone will take you to another preparation room and give you lecture materials and draft paper. You can make a draft according to the lecture materials within the specified time, get familiar with it, usually 15 minutes to prepare, and finally someone will take you to the lecture room to give a lecture in front of the judges.
Wish you success! Wish you success!