Elective courses are not a matter of choosing several courses. Generally speaking, it is stipulated how many credits a university should complete in four years, which is generally 12. If you don't finish the course, you won't get the diploma. Then each course has a score, usually one or two points. You can make full use of elective courses to learn what you like and improve your comprehensive ability. You can choose according to the number of courses you have each semester. If there are more courses, learn less, choose one or two courses, and if there are fewer courses, choose one or two more. I hope I can help you and adopt it.