I majored in agriculture and graduated from graduate school a few years ago. Chemistry and mathematics are compulsory basic courses for postgraduate entrance examination. At present, there is no one who does not take these two courses in the agricultural postgraduate entrance examination. As far as I can remember, it seems that only agricultural archaeology doesn't take these two courses, but I want to learn Chinese archaeology. In that case, why take the exam? If you cross majors, you have to take math, not chemistry.