In a scene more apt for a concert than a lecture, a classroom at the Chengdu University of Electronic Science and Technology was packed past capacity on Tuesday. /Weibo Photo

This calculus class is known as one of the most difficult and popular courses at the university, as the professor uses interesting and humorous methods to help students understand the calculus theories. /Weibo Photo

During this class, students even take pictures or videos to record the information. In order to get a seat, some students have come to the classroom at the night before. The late students are left to stand outside the door or some even sit on the window sill. /Weibo Photo