One pressure to promote has to come from the desire to pass the little hellions on to the next grade so the teacher doesn’t have to deal with them two years in a row.
I’ve seen parents go to nx years Superintendent, (after original Super moved on) attempting to force a teacher within the district to change grades from the previous year. The teacher told super that he could change the grade but she would not, student got what the student earned. Teacher told super that he could fire her but she wasn’t changing grade. So much politics in our schools today, pretty tough to deal with it all.