Self-taught examination is a single-subject graduation examination. Candidates need an exam, get a certificate through an exam, and must pass all the exam subjects before applying for graduation. The difficulty of self-taught examination depends on the difficulty of the major selected by the candidates, and the difficulty of the major is determined by the courses studied. Self-taught undergraduate students need to take about 14 subjects, including English, mathematics and computer, and take up to four subjects every year.