1. After entering the university, students can change their professional applications during their freshman and sophomore years. This is relatively difficult, and it is the most difficult of the three methods, because if you apply for a major as a freshman or sophomore, the basic courses you study are different. If you want to change your major, you need to make up some important basic courses, and you should also take the professional courses. When your grades meet the requirements, you can consider changing your major. This method requires a higher standard, unless your grades are very, very good, otherwise it is generally the case.
2. Second, continue to study this major. While studying this major, you can minor in the major you want to change. This is very common in universities. For example, many students are minoring in many economics majors and law majors.
3. The third way is to change your major when you are in graduate school, that is, to test the major you want to change when you are in postgraduate school.
4. You can choose a major after you leave the army.