You think too much now. Enter the school first. After three years of university baptism, you decide what major to take in the postgraduate entrance examination. But I remind you that the postgraduate entrance examination should try not to cross majors. Many units don't like interdisciplinary students, because when you graduate, the recruitment is based on the postgraduate major, but your undergraduate course is not your major, and the foundation is not good, so the unit doesn't want it.