I ran across a old contract for teachers here in Kentucky. There were many interesting things in it but one I found to be fascinating was the one where a teacher would not be paid if his/her students failed the exam given by the master of the school district as he made his rounds checking up on the one room school houses that dotted the countryside.
Oh yes, this is worthy of note... the real Amish here still run their own one-room school houses. There are two within five miles of my home here.
That was back when School Boards were filled with involved parents who had real power, when schools weren’t consolidated and kids learned or the teacher was fired.
The Amish in my part of the country are not taught by Union teachers, but by the girls who have already passed the 6th grade and pass their learning on.