Three teachers are responsible for three questions and 20 students draw lots.

Summarize all the questions into several numbers according to the scope, and try to make the knowledge points covered by the questions comprehensive. Combine them into several or more groups of questions, and each group can be numbered, so that students can draw them once.

The teacher just needs to put all the questions aside, take a form, match the number of the questions with each number and record it on it. Isn't that okay?