That's normal. I taught college students, so we could fail them and usually not have to deal with parents.

No students ever failed. 
They were always moved up with their friends, regardless of their level. 
Just one of those types of schools. 

Satosora

Sure, I had those too, but the students who were going to fail did so in either case.

I just thought it was interesting that my grade distribution always seemed to be about the same, whether I made the class easier or harder.

Undisciplined

alter_native

Generating quick mindmaps

cryotosensei

That does work for some. 
The rest just dont care. 
The only reason why they were in the class was so the school could make money off of them. 
Their level was not at the level it should have been. 