Nine books. According to the inquiry of China Education Bureau official website, there is a book in the first grade of secondary vocational school. The main subjects that senior one students in secondary vocational schools need to learn are Chinese, mathematics, English, politics, history, geography, physics, chemistry and biology. Each subject will have corresponding teaching materials and auxiliary materials. Secondary vocational schools refer to all kinds of vocational schools established with the approval of relevant government departments according to law and implementing full-time secondary education. The enrollment targets are junior high school graduates and junior high school equivalent, and the academic system is three years.