The undergraduate degree of correspondence recognized by the state can be found in Xuexin.com. Xue Xin. Com is the only designated higher education certificate inquiry website in China. You can check the internationally recognized full-time, self-taught, adult and correspondence college education, but you can't find high school or secondary school education in Xue Xin. com。 There are four ways to improve the academic qualifications of adult education in China, namely, self-study examination, adult college entrance examination, online education and national open university. Correspondence is a form for adult college entrance examination to enter middle school. It also belongs to the national education series and is a formal diploma recognized by the state.