I was deeply touched by reviewing mathematics recently. I have done some moderately difficult questions recently. These questions are really perfect and interlocking, which really makes you feel the meticulousness of mathematics. I have to sigh that I can still do this problem, which makes me full of praise. After I finish my study task, if time permits, I will help my classmates to do math problems for the postgraduate entrance examination, which will not only help my classmates, but also improve my math problem-solving ability. Sometimes, it helps me find loopholes in my knowledge, for example, what other knowledge points are my weak links. By finding these weak links, I gradually improve myself. Because my classmates can't do the problem, there may be situations where I can't do it. In this way, I can check and fill in the gaps through my classmates' questions, and then gradually improve my math problem-solving ability. Hee hee, I quite like doing this. Of course, in the process of learning mathematics, I found it really important to establish a set of my own problem-solving system and mathematical framework. So I independently sorted out my notes on high numbers, line generation and probability theory. Three thick big books, I want to see if I can enrich them and add some typical examples to turn them into problem-solving books. This is a bit difficult, and the task is huge. Step by step, as long as you have the heart, you will always succeed. This is my small goal at present, because I am also reviewing mathematics and sorting out many good problems. The methods of solving these problems are still commendable. I hope that in the process of sorting out step by step, there will be new improvements and new insights.