1. The nature of the test is different: PETS is a socialized, open and non-academic English test for all citizens, and it is an ability test to test candidates' English communication ability. CET-4 and CET-6 are large-scale standardized tests sponsored by the Ministry of Education and implemented by the Education Examinations Institute of the Ministry of Education (formerly the Examination Center of the Ministry of Education).
2. The purpose of the test is different: PETS focuses on examining the candidates' English communication ability. The purpose of CET-4 and CET-6 is to promote college English teaching in China, objectively and accurately measure college students' English ability, and provide services for improving the teaching quality of college English courses in China.