Candidates from this province have an advantage in applying for colleges and universities in this province because the number of students admitted is much higher than that from other provinces, so they can admit some students with lower scores than those from other provinces, not because they are candidates from this province, but because of the number of students admitted.

For example, this province enrolls 100 students and 50 students from other provinces. Then the scores of candidates in this province may be cut to 500, while candidates from other provinces may get 530. To some extent, this is a decline in scores.

There is an advantage in essence, not a one-second drop in admission. That's the published score, and it won't drop any more.

Is this explanation understandable? I hope I can help you ~