I think it varies from person to person. When I was at school, I insisted on going to class with my roommates every day and never skipped any class. Even if it is the kind of irrigation water class, I will go to the classroom to read professional books. Occasionally, when the teacher irrigates, I will talk about some classic things. If it is a professional course, I basically listen carefully, but after all, a class is too long, and it is difficult to keep my attention all the time. But there are also many students who don't attend classes at all or go to the classroom to play mobile phones in another place. University is a place to test self-control and the ability to think and live independently. Basically, students with clear goals and ideas have their own systems, while students who have been confused are confused every day.