Not necessarily. For example, English textbooks, because they are online learning, must be genuine, usually through schools, so that they can have activation codes. For other books, you can buy new and used books, or copy them yourself, or borrow them from seniors. Both will do. At present, many schools do not order textbooks in a unified way, so they can only buy them themselves.

Function:

(1) Textbooks are the main materials for students to acquire systematic knowledge and learn during school, which can help students master what teachers teach. At the same time, it is also convenient for students to preview, review and do homework. We should teach students how to use textbooks effectively and give full play to the role of textbooks.

(2) Teaching materials are also the main basis for teachers to teach, providing basic materials for teachers to prepare lessons, attend classes, assign homework and evaluate students' academic performance.

(3) According to the requirements of the curriculum plan of this discipline, analyze the teaching objectives, content scope and teaching tasks of this discipline.

(4) According to the position of this discipline in the whole school curriculum, studying the relationship between this discipline and other disciplines is the basic and best way to integrate theory with practice, which is conducive to determining the main teaching activities, extracurricular activities, experimental activities or other social practice activities of this discipline, and making overall arrangements for classroom teaching and extracurricular activities at all teaching stages.