I can't. Tianjin polytechnic university official website inquired that candidates who have not completed relevant courses cannot apply for CET-4. Applying for CET-4 requires a student status and a certain process. Freshmen will enter school in mid-September, followed by military training. After the military training, they will register as students. However, the registration time for the second half of Band 4 is around 10. At that time, the candidate's student status was not fully registered, so he could not register for Band 4.