During the kerfuffle, I was finding it difficult to pick the right moment to mention that DS2's school (and preferred sixth form) isn't even a grammar, let alone a superselective.
The main school (Y7 - Y11) is partially selective (25% on academic aptitude, 10% musical aptitude, the rest EHCP, siblings and local area). There's the whole range of ability, but the curve is definitely skewed towards the more able end.
Because of the excellent SEN provision and ASD expertise, it has a higher than average proportion
of students with additional needs, particularly those on the autistic spectrum.
The attached sixth form only offers academic A-levels in traditional subjects, it is oversubscribed and can afford to pitch its grade requirements quite high.
There are other options locally for those who want more vocational level 3 courses (although hardly any options for those who want to study a combination of both).