1. High school textbooks+high school teaching AIDS+chemistry Orsay Classic (not a higher volume, but a general one)? Needless to say, the first two books must be read before the teacher's progress, and the sooner the better. Don't forget elective courses, especially material structure and organic. ? Chemistry Olympiad Classic is one of several Olympiad Classics, which is relatively less difficult and most suitable for connecting with senior high school. You can do the questions while watching. Write down what you have tried many times and still can't do. ? The competition is mainly composed of four parts: organic, inorganic, materialization and analysis, which are relatively independent. If you are organic in high school, you can start with organic. If you have no foundation, you can start with inorganic atomic structure and molecular structure. ? 2. What are the questions in the regional preliminaries+inorganic and organic textbooks? It's not difficult to prepare for most of them, and most of them who have studied well in senior three can pass. It is very beneficial to enter the semi-finals of the competition (that is, the national preliminary competition) after the end of senior one. 3. There are more and more in-depth competition guidance books, most of which are from Zhejiang University and Tsinghua Publishing House. At this point, you should be able to turn over a few pages to see if this teaching aid is suitable for you. ? You can find a real problem trainer ten years ago, but don't do too much. After all, there is only one real question every year, which is very limited, and the level of simulation questions is far from the real question. Save it for three months before the exam (basically around the summer vacation of sophomore year)