I was pretty much the brightest at my very ordinary comp. and failed my first year at University. (the one thing I wasn't top in was maths and most students had done further maths).
Yes it was a rude awaking being faced with tutorial sheets I hadn't a clue how to do. No way did I have the work ethic to try and learn the things I'd left school without knowing.
I changed to the science I had the equivalent of A* in and sailed to a 2i without doing any work.
Would I have worked harder and got a first had I been to a highflying grammar. I don't know (our area didn't have them).
Certainly DH, who did go to grammar school, is harder working than me.
He obsessively has to learn all there is to know about any technical thing that crosses his horizon. He is utterly useless at doing nothing, reading fiction or watching junk TV.
Is that because of his school, academic teacher parents or a faintly AS temperament that finds things way easier than people? I don't know.
DD2 is going to the less academic school. Yes it's logistically far easier, but also she is exactly the sort of child who likes to shine. Academically she would hold her own at the grammar, but I fear she'd give up ever extra curricular activity.
Faced with girls with grade 4+ music, who's larger primaries and private schools take sport seriously and many of whom do stage coach I think she would just say they'll never choose me.
The comp. does art, drama and music very seriously indeed, but in an inclusive way. It doesn't assume you've done lots already.
There are orchestras, bands and choirs for all standards.
Many of the feeder schools are tiny so they don't expect them to already have played much netball, hockey etc.
Clearly only time will tell if we've made the right choice, but in the mean time she, hopefully won't drown in HW.
(well she will drown in history HW, but you can't win them all).