The first stage is to change majors across departments. For example, if you originally studied chemistry and want to transfer to the mechanical and electrical major, then this is an interdisciplinary major. The time is at the end of the first semester.
There are several characteristics of changing majors at this stage: 1 Not all departments (and their majors), and as far as I know, some majors in schools such as law school, electromechanical, chemistry and economics and management can be changed. 2 grades are very important, so we must make sure that we don't fail in the first semester and get as high a score as possible. If you choose in time, you can first transfer to the department you want to go to, and then fine-tune it within the department.
The second stage is the end of last semester of sophomore year. The main adjustment at this stage is the adjustment within the department. I am from the School of Economics and Management. There are five majors in our college that can be exchanged, but you must ensure that your grades are among the best as possible.
If you want to change your major, ask your seniors and sisters in advance.
I hope I can help you.