If you go back to the undergraduate course, you don't need it. Nowadays, college curriculum theory is far more than reality, and most of the knowledge you have learned is seriously inconsistent with the actual development. If you really want to study other majors, you can take the self-study exam and take it several times. After all, graduate education is a little better than undergraduate education. If you are just interested, you can teach yourself and practice more. Taking an industry certification is much more valuable than those of the school. There are many such training institutions in society now, and there is no need to take university exams in order to study another major.

I hope I can help you.