In another thread the OP asked whether DC needed tutoring. Various MNetters posted that the DC was sligtly ahead of the national average for that age group and that the OP shouldn't be worrying.
I want my DCs to go to a good university and from there, to get a good job. That isn't going to happen if they aim to be at the national average.
If you are being operated upon would you be happy with your surgeon being 'average'? If you were a soldier going into battle woul you want your leader to be 'average'? etc etc etc.
There is nothing wrong with being 'average'. We all can't be brain surgeons or nuclear physicists but at the same time why do we have to settle for being average?