It's been brilliant for my autistic girls. The other local choice was a "no excuses/detention for getting anything wrong school" and the grammar school has less homework and understands if it's the first time you've forgotten to do homework for example so is a much nicer environment to be in.
It's also calmer without the behaviour issues and without boys.
There really isn't the pressure put on by staff BUt there is internal pressure as all the girls want to do well so it's an interesting environment that way.
There are some with issues but we've often wondered if it's the high achieving personality that means they'd have those issues if they went elsewhere. It just happens that collecting very high achievers in a school together concentrates them?
The girls have loved having Subject specialists and interesting lessons where people (mostly ) want to learn.
A down side I do think though having come from aa lower income family is a bit like going private- friends suddenly have big houses/holidays.
Similarly going from being top to being mediocre. However the growth mindset stuff is interesting as many kids if they sail through being top never learn to work at something.
The thing I do regret though is both mine were sporty and primary and joined lots of clubs, similarly did the school plays etc.
At grammar it's really those who play for the country/played at private school that join the teams and those who are seriously good at drama from older years that get into the play.
Also - you can go from "being good at maths" to thinking "Oh I'm not good at maths" for example because you're no longer top set. But really you're on track for a 7-9 and actually are if that makes sense. So can internalise the "I'm not good at x" because it's relative to a very high achieving cohort.