Elective courses in humanities (that is, elective courses in the whole school) are divided into three categories: natural science, humanities, art and others. Each student gets at least 6 credits. Science and engineering students should take at least 3 credits in "Humanities and Social Sciences" and at least 3 credits in "Arts and other subjects", and it will be ok to get these 6 credits. Others are interested in learning. But it is not necessary, and most elective courses are of little practical significance. If the credits exceed the regulations, you have to pay extra. If you are interested, it's not bad to go and sit down.