I say that having had a bad experience with this. A mother told me I was not doing a good job unless HER daughter made an A. I was there just for her child, not the rest. Her child was not an A student, others were. That was my last year to teach in that district. She later became Pres of the School Board.
Not all parents want the best education for their child. They just want to be able to say my child is in Algebra, or my child is gifted. The child's 'achievements' are gold stars for the parents, regardless of the ability to perform in the real world.
But if they are paid if their child achieves a certain level on state exams, they may want that?