Undergraduate advanced mathematics teaching is divided into four levels: A, B, C and D (some schools divide it into 1, 2, 3 and 4 according to the classification of postgraduate entrance examination), and the difficulty decreases in turn. Advanced mathematics is a basic subject formed by calculus, algebra, geometry and their intersection. The main contents of advanced mathematics include: series, limit, calculus, spatial analytic geometry and linear algebra, series, ordinary differential equations. Advanced mathematics is a basic subject for postgraduate examinations in engineering, science and engineering and finance.