There are two ways to change majors.
The first method is to transfer the top 3-5 students in the class. Personal application-college review and recommendation-transfer to professional college for review (individual needs interview)-signature of school leaders-filing of academic affairs office-formal transfer.
The second method: exam content: science is math and English. The liberal arts is English, some universities add politics, and some add computers. When I got to school, I knew what courses I used to take. Test scores are sorted by arts and sciences, and applicants choose their own majors in turn according to the sorting results.