According to the information I know at present, the Ministry of Education has expressly stipulated that it is forbidden for people with college student status and related degree certificates to take part in the national college entrance examination! Personally, I think it is more likely to change departments, and colleges and universities have high requirements for changing departments unless you are good enough or have a good relationship! You can refer to the following provisions:

Section 3 Changing majors and transferring students Article 19 Students should generally complete their studies in the accepted schools. If you are sick or have special difficulties and can't continue studying in our school, you can apply for transfer. Article 20 A student may not transfer to another school under any of the following circumstances: (1) He has been enrolled for less than one semester; (2) From the next batch of schools where students are enrolled to the last batch of schools, from low academic level to high academic level; (three) to determine the orientation of entrusted training when enrolling students; (four) should be suspended from school; (five) other without justifiable reasons. Twenty-first students transfer, with the consent of the two schools, the transfer school reported to the local provincial education administrative department to confirm that the transfer reason is justified, and can go through the transfer procedures; Inter-provincial transfer scholars shall be transferred from the provincial education administrative department of the transfer place to the provincial education administrative department of the transfer place, and the transfer procedures shall be handled after confirming the transfer conditions.