The use of Class A mathematics in the National College Students' Mathematics Competition is a guide to the entry of the National College Students' Mathematics Competition. This entry guide is recommended by the working group of the national college students' mathematics competition, and it is also a reference book for the examination contents in the notice of the 14th national college students' mathematics competition. Editor-in-chief by Teacher She Zhikun, compiled by the proposition group of the national college students' mathematics competition.