Geochemistry is microscopic geology. Analyzing the origin and element distribution of the earth from the perspective of elements has many classifications and wide applications, which requires extremely high professional quality. At present, the only school in China that has made achievements in geochemistry is the Department of Earth Sciences of Nanjing University. And CAS is more professional. There is a branch school in Guiyang, and the score is not very high. You can consider it. In addition, Nanjing University doesn't take math test in geochemistry, so you can check it for CAS students. You'd better prepare the exam outline so that you can take the postgraduate entrance examination. Hehe, I wish you success!