Hello. Give you the following suggestions: ① Try to arrange elective courses in freshmen and sophomores because there is plenty of time. If you have to take a large number of professional compulsory courses at the beginning of your junior year, it is easy to conflict with elective courses. If you like to attend classes on weekends, you can choose elective courses on Saturday or Sunday, and if you like to attend classes from Monday to Friday, it is also possible. It varies from person to person. Elective courses are usually tested in the form of papers, which do not require much time for review and preparation.