That is the problem with most Nigerian parents. They think teachers are magician to make the magic happen on their kids because they are paying a huge school fees. No, even the parents have a role to play too.
Just like you have said, parents should be actively involved in their children's academics, in this way, they notice what is right and not right.
For teachers, they need more trainings to do their best because everyone need to be updated with the current learning.