Advanced mathematics is very theoretical and rarely used in general work, but if you plan to take the postgraduate entrance examination, you'd better study mathematical engineering drawing with your heart now. If you plan to engage in equipment manufacturing, especially design work in the future, you will have to deal with drawings every day. If you are engaged in technical work, the requirements for drawing are relatively low. If you want to start a business, it doesn't matter whether you learn or not, but you still need to understand the general CAD drawings.