your child has definitely not been over tutored.
It's a "nuclear war "out there, the days when a rough diamond could walk into an 11+ exams and pass are long, long gone
I always assess any potential student and if a child is not GS standard or does not have the potential to keep up to pace of work at highly selective schools, I am very direct and tell parents that their understandable ambitious expectations are not in the best interest of the child, good tutors don't have to chase work !
But some prep is essential to just compete, be it, DIY or from a professional tutor.
I NEVER tutor children from prep schools - jeez how much prep do they need!! This not from some ideological stand piont but it simply is not in the best interest of the child, and believe me I have been offered £200 per hour (and on one occassion to go to Barbados for 6 weeks fees/flight /accommodation payed for !) for such children of unrealistic parent!! Sad really.