Correspondence education is a kind of adult college entrance examination education, which mainly refers to the learning mode that schools mail textbooks to students and students mail homework and test papers to schools. There are three ways to learn: from high school to junior college, from high school to undergraduate and junior college! Adult college entrance examination has many forms, such as full-time, half-day, correspondence, night university and so on! Correspondence has the form of concentrated study on Saturday and Sunday, and also has the form of concentrated study for one or two months every year and self-study on leave. Students who graduate by correspondence receive correspondence education, which is recognized by the state as adult education.