1, there are many conceptual questions in multiple-choice questions, and some unusual knowledge points and conclusions are investigated, which requires candidates to have strong understanding and adaptability.

2. Fill-in-the-blank questions and solutions have a large amount of calculation, involving some complicated skills such as substitution, integration and differential equations, which require candidates to have high calculation ability and accuracy.

3. There are two proof questions in the solution, which require candidates to use the knowledge of extreme value judgment of multivariate functions and positive definite quadratic form, and require candidates to have good logical reasoning ability and proof skills. Therefore, it is more difficult to take the postgraduate entrance examination for Mathematics II in 2022.