I'm a junior in the Department of Mathematics, and I'm going to study in Germany. What major should I choose? It takes several years to graduate from a multi-major program. Experienced answer, thank you. Mathematics is a basic subject, in fact, it is easier to change majors. If you want to change your major when applying, you can apply for mathematics-related majors such as economic mathematics and computer, and you should hopefully get the notice. Of course, if you apply for the original major, there is no problem at all. But basically, cross-major means starting from freshman year and starting all over again. Only some basic courses can be exempted. The curriculum of German universities is not the same as that of China, and the specific situation can only be understood when you enter the university. In German universities, course selection is also a science.