Thanks for your thoughts and explanations. I've asked the question because I am frustrated.
Dd is in a school in America (private, with a very good reputation), so I realise we are in a very different situation to what is 'standard' in the UK.
When we moved here from the UK, dd was far ahead of her US peers - which I put down mostly to the fact that UK schools demand more at an earlier age.
Three years later, I see that though she is learning (and happy), dd is rarely challenged. She now believes that most everything should be mastered easily and almost perfectly. She gives up quickly if something is tricky, as her capacity for experimenting/trying different approaches/taking risks is gone - she will not try if she doesn't think she can do things 'correctly'. ATM, almost all of her mistakes are careless and slap-dash rather than because she doesn't understand the work.
She often seems to be paired with the children who are struggling (usually rambunctious boys who presumably will benefit from her good example, and ability to stay on task). The school, teachers and parents do an admirable job of offering these children support so they don't fall too far behind. The school learning specialist spends individual time with them (outside class), and families additionally employ tutors, as needed, to reinforce what is taught in the classroom.
My impression is that the school's compassionate approach to supporting these children is an anchor that drags on the general progress of the class. I understand that the more able children can't steam too far ahead as the group disparity would become too great.
But, I am frustrated that general resources are directed at teaching to a mid-range of mastery, with all 'special' resources directed at those who are struggling to keep up due to learning or behavioural difficulties.
We've just come back from a visit to the UK, and when I observed what dd's UK peers are doing at school, i felt once again that our current situation is far below what dd is capable of (and would be doing if we were still in the uk).
All a very long-winded way of saying that I wish some of the time/energy of the learning specialists could be directed to children like dd who are capable of doing more, and would thrive if challenged.
Sorry for the essay.......any suggestions are welcomed.