Self-taught examination in higher education, referred to as self-taught examination for short, is a form of higher education that combines individual self-study, social assistance and national examination. The graduation certificate is registered electronically by the Ministry of Education, and can be queried and verified on Xuexin.com (the website of the Ministry of Education for inquiring about formal education), which is common throughout the country. Self-taught diploma is difficult to test, and the pass rate of self-taught diploma is very low (less than 10? Therefore, it is generally necessary to take part in the pre-test remedial class to take the self-study exam, which can greatly improve the pass rate of the exam.