Fran 0251, I do so agree with you. I passed the 11+ 60 odd years ago and went to a grammar school. In the second year we had an intake of the top girls from the secondary modern, who were well up to a grammar school education, so it wasn't fixed in stone that if you failed the 11+ you were forever at the bottom of the heap and couldn't better yourself. My boyfriend want to the Sec Mod and got exactly the same number of GCEs as I did and in academic subjects, so it really didn't matter too much if you were in a grammar or a Sec Mod, if you wanted to succeed, you could. he went on to get a good job. In addition, there were the technical schools, which provided a middle way.
I spent all my working life teaching in comprehensive schools and the trouble with them is that, while they are great in theory, they just don't work as well as the old system, as they are far too big and the staff can't possibly know all the pupils, so the naughty ones can get away with murder (not literally!) In most comprehensives there is streaming, which shows up the differences between the children's ability even more than if they were in different schools. If the children aren't streamed, the clever ones tend to be neglected as the teacher has to give all their time to helping the ones who are struggling and the clever ones are often given extra work to do on their own while the others get all the attention. The old system of different schools was much better as it didn't hold back the brightest pupils and everyone was on a level playing-field. The children got much more individual attention as the schools were much smaller and everyone was known by name, so you could keep an eye on every individual pupil.