As a private tutor, I can say this:
If the student is lazy and couldn't give a sh*t about his work,
even Stephen Hawking himself cannot do anything for him.
If the student is hardworking and willing to learn, then tuition
can be a very good thing.
The same goes for my students. Those students of mine who
benefit the most are those who pay close attention to what I teach
and put in their best effort.
Meanwhile, those students of mine who benefited the least are
those whose minds are in another galaxy while I teach and just
couldn't give a damn about their own work.
So before you go around pointing your finger at the tutor, it
would be good for you consider whether your own child might be the
problem.