The time must be accurate, and the organizer should give notice within a few minutes. It's not good to delay or spend too little time, but it's better to finish it within 30-50 seconds in X minutes. Fluency should be coordinated with ppt. Of course, these should be practiced in advance. Considering this is your first time, I believe it will take 2 to 3 days at most.

You can take some information with you. Look when you answer questions. If you are asking conceptual questions, you'd better not read the information. The best thing is that these materials are all pictures and tables. When you ask relevant questions, show them to the judges. I believe this is the most convincing answer.