At present, most schools will provide opportunities to change majors when they enter school. Generally arranged in the late first semester, you can apply for changing majors after you know the situation of each major.
As for the conditions for changing majors, each school is different, and most of them will have a ratio, such as 15% of candidates.
You are already in school, so you can find out about changing your major (Academic Affairs Office).
Each school has its own regulations on how much tuition can be refunded. Now that you are at school, you should ask yourself. ...