The study of mathematics is mainly based on basic knowledge, and the difficult problems are only synthesized on the basis of simple problems. So the content in the textbook is very important. If you can't master all the knowledge in the textbook, you won't have the capital to learn by analogy. It's best to preview the contents of the textbook before class, otherwise there is a knowledge point that can't keep up with the teacher's footsteps in class, and the following is unknown. This vicious circle will start to get tired of mathematics, and interest is very important for learning. Targeted exercises after class must be done seriously and not lazy. You can also calculate the classroom examples several times when reviewing after class. After all, in class, the teacher is calculating and explaining problems, and the students are listening. This is a relatively mechanical and passive process of accepting knowledge. Maybe you think you understand it in class, but in fact, your understanding of problem-solving methods has not reached a deeper level, and it is very easy to ignore some difficulties that will inevitably be encountered in the real problem-solving process. "A good brain is better than a written one." For solving mathematical and physical problems, it is not enough to rely only on the general ideas in the brain. Only through careful written calculation can we find the difficulties, master the solutions and finally get the correct calculation results. Secondly, we should be good at summarizing and classifying, looking for the * * * relationship between different types of questions and different knowledge points, and systematizing what we have learned. To give a concrete example: in the function part of senior one algebra, we have studied several different types of functions, such as exponential function, logarithmic function, power function, trigonometric function and so on. But comparing and summarizing, you will find that whatever kind of function we need to master is its expression, image shape, parity, increase and decrease and symmetry. Then you can make the above contents of these functions into a big table and compare them for easy understanding and memory. Pay attention to the combination of function expressions and figures when solving problems, and you will certainly get much better results. Finally, we should strengthen after-school exercises. Besides homework, find a good reference book and do as many exercises as possible (especially comprehensive and applied questions). Practice makes perfect, thus consolidating the effect of classroom learning and making your problem solving faster and faster. I have heard of the "three-more method" of "understanding more, practicing more and summing up more" summarized by a Shanghai middle school student. I think this method can summarize the main points of physics learning in senior high school. Understanding is more about grasping preview, attending lectures and reviewing tightly, and understanding what you have learned from multiple levels and angles. Preview can be divided into rough reading and intensive reading. Take a cursory look at what you want to learn first, and circle the important parts in the form of subtitles. Then read the circled part carefully and have a deep understanding, that is, intensive reading. In class, you can listen to the teacher explain the difficult points and answer questions purposefully. Only in this way can we understand knowledge more comprehensively and thoroughly. In after-class review, in addition to understanding and memorizing formula theorems, we should also deeply understand the teacher's lecture ideas and the "central idea" of solving problems, that is, grasping the knowledge points of examples and applying formulas of what theorems to make them orderly and procedural. More practice refers not only to the practice of consolidating knowledge, but also to the "practice" of psychological quality. To consolidate the knowledge, we should not only complete the in-class exercises seriously, but also complete a certain amount of extracurricular exercises. However, simple "sea tactics" is not desirable, and some representative questions should be selected. Students with a good foundation have to do some comprehensive problems and application problems. In addition, we should pay attention to adjusting our mentality on weekdays and cultivate a calm and confident psychological quality. To sum up, we should first classify and sort out the classroom knowledge in detail, especially the theorem, deeply understand its connotation, extension, derivation and scope of application, sum up the relationship between various knowledge points, and form a knowledge network in our minds. Secondly, we should analyze and summarize the solutions to various problems. Another kind of summary is also very important, that is, after the usual practice and examination, analyze your own mistakes and weaknesses in order to overcome them in the future. I have heard of the "three-more method" of "understanding more, practicing more and summing up more" summarized by a Shanghai middle school student. I think this method can summarize the main points of physics learning in senior high school. Understanding is more about grasping preview, attending lectures and reviewing tightly, and understanding what you have learned from multiple levels and angles. Preview can be divided into rough reading and intensive reading. Take a cursory look at what you want to learn first, and circle the important parts in the form of subtitles. Then read the circled part carefully and have a deep understanding, that is, intensive reading. In class, you can listen to the teacher explain the difficult points and answer questions purposefully. Only in this way can we understand knowledge more comprehensively and thoroughly. In after-class review, in addition to understanding and memorizing formula theorems, we should also deeply understand the teacher's lecture ideas and the "central idea" of solving problems, that is, grasping the knowledge points of examples and applying formulas of what theorems to make them orderly and procedural. More practice refers not only to the practice of consolidating knowledge, but also to the "practice" of psychological quality. To consolidate the knowledge, we should not only complete the in-class exercises seriously, but also complete a certain amount of extracurricular exercises. However, simple "sea tactics" is not desirable, and some representative questions should be selected. Students with a good foundation have to do some comprehensive problems and application problems. In addition, we should pay attention to adjusting our mentality on weekdays and cultivate a calm and confident psychological quality. To sum up, we should first classify and sort out the classroom knowledge in detail, especially the theorem, deeply understand its connotation, extension, derivation and scope of application, sum up the relationship between various knowledge points, and form a knowledge network in our minds. Secondly, we should analyze and summarize the solutions to various problems. Another kind of summary is also very important, that is, after the usual practice and examination, analyze your own mistakes and weaknesses in order to overcome them in the future. There are three points to be grasped in the study of chemistry, namely, grasping the foundation, grasping the thinking and grasping the law. Paying attention to the study of basic knowledge is the guarantee of improving ability. Learn the basic concepts of chemical terms such as element symbols, chemical formulas, chemical equations and properties of elements and compounds. To do problems, you should be good at summing up the types of questions and solving problems. There are inherent laws between chemical knowledge. If you master the rules, you can control and remember knowledge. Such as the general law of valence, metal elements usually show positive valence, nonmetal elements usually show negative valence, the valence of simple elements is zero, and many elements have valence changes, and the valence States are different under different conditions. There is a saying about chemistry that chemistry is a liberal art in science. Because chemistry has a lot to remember and is an experimental subject, we should pay attention to the combination of reading, hands-on and writing in the learning process of chemistry. You should deduce, calculate, write structural formulas, write chemical equations, or do experiments yourself to verify, deepen your impression and help you understand. Sometimes you have to look for information and supplement some materials. At the same time, in chemistry learning, it is a basic activity method and a basic method to improve the effect of chemistry learning to put forward the contradictions within or between chemical things after thinking, that is, to study and solve chemical problems by yourself or to ask others for help when they can't solve them.