My DD is 12 and in y7 at a non selective private school.
also top of everything with straight 9's predicted in CAT 4 tests (lots of 9.9, so even if she gets straight 9s at GSCE school will "loose value" on her)
She is top of school in maths challenge and some coding thing too.
She is happy where she is (was in same independant school for primary too)
She has a scholarship (but this doesnt do anything for the many trips she will go on)
She does lots of sport, in many school teams, she is heavily involved in scouting, and also does lots of music, singing and playing instruments.
She does lots of park run and is challenging herself on zwift so she is physically pretty fit.
She is very well traveled and reads a LOT. She enjoys cooking and gardening (especially growing fruit / veg which we eat)
She is happy and that's all I care about. Not sure how challenged she is but she's in all the top sets (where they are set) and her teachers are good at challenging the brightest.
She also trys her hardest (even though she doesnt need to).
My DD could have gone to a couple of top grammar schools (did amazing in her 11+ and got the place) or could have gone to some selective independant schools further away, which may have had more of the very bright children and you can only get in if you pass their exams, but we chose to keep her more local, in a non selective, so has a broader range of children (including tops sports people, and artists who may not pass their 11+ but who have other amazing talents) where she is happy, and I don't regret my choice (yet)