Public elective courses are taken once every semester, and two courses can be taken every semester. General schools will arrange for students to take public elective courses next semester. They can choose courses according to their own interests, but they should grab classes, because schools have credit requirements for public elective courses, and they can only graduate if they meet the requirements. Moreover, there are certain restrictions on the number of courses and the number of students in school, and they need to grab classes to get credits.