The biggest difference among the three types of mathematics papers lies in the requirements for knowledge: mathematics 1 is the widest, mathematics is the third, and mathematics is the lowest.
Mathematics 1:
① Advanced mathematics (function, limit, continuity, calculus of univariate function, vector algebra and spatial analytic geometry, calculus of multivariate function, infinite series, ordinary differential equation); ② Linear algebra (determinant, matrix, vector, linear equations, eigenvalues and eigenvectors of matrix, quadratic form); ③ Probability theory and mathematical statistics (random events and probability, random variables and their probability distribution, two-dimensional random variables and their probability distribution, numerical characteristics of random variables, law of large numbers and central limit theorem, basic concepts of mathematical statistics, parameter estimation and hypothesis testing).
Math 2:
(1) advanced mathematics (function, limit, continuity, calculus of one variable function, ordinary differential equation); ② Linear algebra (determinant, matrix, vector, linear equations, eigenvalues and eigenvectors of matrix).
I hope I can help you.