What kinds of rules are common in a school

I think the most common rules are that you have to be silent during class and also pay attention to the course. For example, you should not use any kind of mobile phone when you are taking the course. That is not only for the two people themselves, but you are also responsible for not [...]

I think the most common rule is that you have to be silent during classes. That should be an international standard because, in order to focus and keep your attention on the course, you shouldn't make any noise except if you have questions for the teacher or the professor.