CET-4 is a national teaching examination presided over by the Higher Education Department of the Ministry of Education. The main target of the examination is undergraduates or postgraduates who have completed CET-4 according to the syllabus. As social candidates cannot apply for CET-4 and CET-6, with more and more English learners, PETS is likely to become the most popular social test. As a social test, PETS does not have the function of evaluating the English teaching level in ordinary middle schools and universities. No one is allowed to use the results of this test to evaluate and interfere with the normal English teaching in schools, so the results of PETS test cannot replace the English graduation exams in ordinary middle schools and universities. The results and effectiveness of PETS examinations at all levels are determined by the admissions department or the employer.