Besides typical examples, we also need to pay attention to our own mistakes. The wrong problem set is necessary for many students with good grades, and I am no exception. What I emphasize here is how to make full use of my wrong problem set. There are probably two kinds of wrong questions: one is that you can't do it at all because it's too difficult and there is no idea; The other is that you can do it yourself and make mistakes because of carelessness. In my opinion, the most valuable wrong question is the second category. Because there are many kinds of carelessness, we should also analyze it. First, read the wrong topic. Is it a wrong number or a wrong meaning? Why did you read the wrong question? How did you misunderstand the meaning of the question? Will you make the same mistake in the future? Second, the starting point and thinking are wrong, and such a thinking solution is not suitable for this kind of topic at all. Third, the calculation is wrong. Why is it wrong? Is there any way to stop it? How can we be really careful? In fact, how many questions are there in the college entrance examination that you won't do? The final contest is still about how much you can do right. If you can put an end to your careless mistakes, you will certainly get very good grades in the college entrance examination. Physics is a headache for many people, but I feel relaxed. I summed up a method-showing movies (this method is only applicable to the review stage of senior three), that is, selecting some classic old questions, constantly recalling knowledge points when reading the questions, connecting divergent points, and putting them in the past as quickly as a movie on the screen. Or, according to the book catalogue, by reading the title, recall the contents, knowledge points, mistakes, difficulties and doubts of each chapter, then carefully check section by section, recall the test sites and examples, and finally recall them one by one, and so on, sort out the knowledge points. When applying the film projection method, remember to stick to textbooks and put textbooks first. The knowledge points of chemistry are rather broken, so many students keep their notes in the same notebook in chronological order. If their memory is not very good, it may take a lot of energy to look it up. In order to solve this problem, I usually use a loose-leaf book to classify and record the unfamiliar scattered knowledge selected in class or exercises according to chapters or standards that I can easily distinguish. Because it is a loose leaf, it can be supplemented at any time. For example, the basic theory can be written in one place, the chemical experiment can be written on the second page, and other new contents can be supplemented at any time. If a page is full and there is no blank page behind it, you can add another blank page to continue writing. This can be a good summary of a lot of fragmentary knowledge, and it will be more systematic when reviewing in the future, and it will be very convenient to find information. After a long time or many times of searching, many things will naturally be remembered. I also have a wrong book. Some topics have typical traps and are worth remembering. The key point of this method is that when learning chapters related to elements, in class, use pens of different colors or special symbols to mark the properties of simple substances and compounds of elements that teachers emphasize and that they think are important or can't remember well. After learning the contents of each chapter, I established a chart containing the mutual transformation of substances, important reactions and important properties of substances according to my own understanding of knowledge, and formed a graphic network according to the relationship between the mutual transformation of substances. There are often some unfamiliar nodes or "lines" in this map. We can mark these "points" or "lines" specially and mark them beside the map. This can not only deepen our understanding of the internal relationship of knowledge and deepen our memory, but also provide a clear direction and a good auxiliary tool for future review, saving us a lot of time and brain power.