Interesting to read the small indie v big state school comments. We did the opposite with eldest DC (ASD/ADHD) - took him out of a small indie during Y7 and put him into the local state comp, where he thrived. He found a small selective school and small class sizes far too intense and intimidating, and was so much happier with a bigger year group, wider ability spread and mix of behaviour. Just shows they are all different!
Current Y11 DS on the other hand has thrived at his indie for secondary - though admittedly it's far bigger than DS1's was, around 200 per year group I think. He finished his last couple of mocks yesterday, so now we wait for results. He seems pretty calm about it but this will dissolve quite quickly if he hasn't managed the grades he is hoping for.