This first sentence. 100%.
Getting in is just the start. It is not just about struggling to keep up, but how it affects your self-esteem.
I went to a super-selective grammar school. I think a friend of mine didn’t fulfil her potential because she went to my school. She was always near the bottom of the class, and I think this made her feel that she wasn’t very good, and she had mentally given up a bit by the time it got to GCSEs. The problem is that she was comparing herself to a cohort of incredibly academic peers. At the time, as a self-absorbed teen, I just thought that she wasn’t very interested in school as she also played class clown. I didn’t recognise that was a defence mechanism. I didn’t realise that she had stopped bothering with homework because she had given up.
I think she would have done better in the top or second set of a comp. Her confidence in her abilities is likely to have been better, and she would have hopefully then remained more motivated and engaged.
i recognise things are different nowadays, and that most children have tutoring even if very bright, but I still think it is an important point that is sometimes forgotten. I am not saying this is the case for any posters on this thread.
In answer to your question. OP, my daughter is in year 5. Most of her classmates who I know will be doing the 11-plus have been going to a tutor for a couple of years. There will of course be others who will either be studying quietly themselves or will take a punt with much less prep.
i understand from my friend who teaches there, that our closest girls’ grammar has recently changed its exam to try to make it as difficult to tutor for as possible to try to level the playing field. Very few children from the immediate vicinity of the school have applied there historically, and they are making concerted efforts to give the opportunity to bright local children, and to try to reassure all parents that their child does not need to be heavily tutored to get a place. I don’t know how achievable that is, as the tutors will surely always catch up with the changes. I also don’t think it will reduce tutoring. I think quite the opposite will happen as the pool of available places for children outside catchment falls.