Reviewing the whole book and Zhang Yu's 1000 question are books used in different stages. When reviewing in the early stage, we should focus on the whole book of mathematics and make every knowledge point clear and thorough. On this basis, the math foundation is ok, and then do Zhang Yu 1000. Zhang Yu's questions are obscure and easy to hurt her confidence. Don't be overwhelmed by these questions.

The three major tests of mathematics are calculus, linear algebra, probability theory and mathematical statistics. Calculus includes: function, limit, continuity, differential calculus of univariate function, integral calculus of univariate function, calculus of multivariate function, ordinary differential equation and difference equation, etc. Linear algebra includes determinant, matrix, vector, linear equations, eigenvalues and eigenvectors of matrix, and quadratic form. Probability theory and mathematical statistics include random events and probability, random variables and their distribution, multidimensional random variables and their distribution, numerical characteristics of random variables, law of large numbers and central limit theorem.