Well, upstairs are basically Higher Education Press and Tsinghua University Press. For example, Calculus A uses the series of College Mathematics-Calculus edited by Xiao Shutie. This issue of Linear Algebra is Linear Algebra and Geometry edited by Yu, Lu Ziqun and Lin Runliang. Circuit Principle is the Circuit Principle edited by Zhu Guiping and Lu. As for C language and C++, it is different. For example, Teacher Li Wanzhou asked us to use his electronic lesson plan and refer to c primer plus. Another teacher recommended the textbook written by Tan Haoqiang. As for English, the reading and writing series is the textbook compiled by the teacher. I heard that it is mainly Longman, not to mention other Marxism-Leninism and thinking.