You can't apply for CET-6 directly. You must get 425 points in CET-4 before you can apply for CET-6, CET-4 and CET-6. Qualifications: Full-time undergraduate, junior college and graduate students in ordinary universities.

Extended data:

Candidates applying for the CET written test must meet the following qualifications:

(1) Full-time undergraduate, junior college and graduate students in ordinary universities;

(2) Full-time adult undergraduate and junior college students;

(3) Only students who have completed the CET-4 can apply for CET-4;

(4) Students who have completed CET-6 and scored 425 in CET-4 can apply for CET-6;

(5) Other qualifications stipulated by the province and school where the candidate is located;

(6) Candidates apply for written test subjects according to school regulations.

References:

National College English Test Band 4 and Band 6-written qualification and how to register