April 15. According to the query of Guangdong Education Network, the sampling time of graduation thesis in Guangdong Province is from April 15 to May 15, and the defense draft of graduation thesis design of each major is extracted from the graduation thesis management system according to the random principle. As a course, graduation thesis is the last link of undergraduate and postgraduate education in general secondary specialized schools, junior colleges, undergraduate colleges, higher education self-study exams.