I used to require level 6, but now I don't. Degree course scores must reach 75 or above, and other course scores must pass. During the postgraduate study, at least one academic paper should be published in a public journal and be the first author. The specific requirements of the paper are different for each college, and you will know when you enter the school. In addition, the most important thing is the final thesis defense, which is more than 30 thousand words, of course not too much. The graduation thesis is a summary of the three-year (now changed to two-year) postgraduate study results, so it must be done well. If you don't pass the defense, you will die miserably, hehe!
The above are the requirements of full-time students, but it is not clear about those who are mixed with diplomas on the job.