If you switch to a major, it is better to override, especially if you switch to an engineering-related major, it is easier to override. Mathematics override is number one, and English politics is unified throughout the country. The rest of the professional courses depend on your own review, but the general professional postgraduate entrance examination will not open a big gap in the professional courses. However, the specific situation of the postgraduate entrance examination still needs to ask the senior and senior of that major in the school you want to take an examination of. In this case, the news is more accurate.