If you want to take an online course, you can choose Ms. Zhang Yu's. Official website has an online course video of mathematics for postgraduate entrance examination. You can look for it, or directly ask the consulting teacher to recommend a tutorial book for postgraduate mathematics. The following are also some books about Ms. Zhang Yu, a graduate math teacher:

Zhang Yu takes you to learn advanced mathematics Tongji 7th Edition, Zhang Yu Advanced Mathematics 18 Lecture, Zhang Yu Probability Theory and Mathematical Statistics 9 Lecture and Zhang Yu Linear Algebra 9 Lecture. In fact, these books are used by students who have signed up for the annual training camp for postgraduate entrance examination, and the books will be distributed to the students who have signed up for the class. Therefore, I recommend a math tutorial book for postgraduate entrance examination. In addition, there will be 65438.