How many books are there in high school mathematics?

The question of how many books there were in high school mathematics was not simple because there were many types of books involved in high school mathematics. The specific number might vary according to the region, year, and different textbook versions. Generally speaking, high school mathematics textbooks would be divided into different levels according to the difficulty. Each level would contain several books. For example, a regular class might use books like " Basic Mathematics for High School " and " Mathematics for High School " while a special class might use more in-depth materials. To be specific, as far as I know, there are many types of high school mathematics textbooks in the world. They are usually classified according to different subjects and difficulties. For example, in the field of mathematics, there were books such as High School Mathematics, High School Mathematics League Guide, and High School Mathematics Competition Guide. In addition, the teaching materials of different regions and countries may be different, so the number of high school mathematics books may also vary. There were many types of high school mathematics books, and it was difficult to determine the number. It had to be calculated according to different regions, years, and textbook versions.