This set of papers is suitable for synchronous exercises and tests in junior high school 1- senior high school. This set of papers is stratified by AB unit and assisted by double tests, which can meet the practice needs of students at different levels. Volume A is used to detect the basic knowledge of the unit, and volume B is mainly aimed at the key and difficult points of the unit. And this set of papers is the original examination questions edited by 400+ famous teachers. Every question has been scrutinized repeatedly, revealing a new idea of the proposition, and at the same time, it can better enhance students' ability and strength. As long as you practice more and master the rules of setting questions, you are not afraid of any exams. I'm glad my answer can help you. Thank you for your adoption.