I can't for the life of me in these increasingly fractionated, tribal times see how splitting our DC up, educationally, and therefore inevitably, socially can possibly be for the overall benefit of society (or is there 'no such thing as society?' Where've I heard that echoed recently??!
) ?
But maybe I'm wrong. Maybe many people can see every reason to separate their DC off from those who are 'other'.
Yes, in an 'ideal' world, you'd imagine there'd be no need for any parent to send their DC to anything other than 'the local comp' but humans are competitive creatures: many will always look at 'good' but then seek what they perceive as 'better'.
FWIW I went to a girls' GS in 1973. It was great for me, the school was full of local primary village girls, like me. We were all of a broadly similar intellect (and of broadly the same social class, too!), there was little recognised or recognisable SEN; my DB, however, went to the local SM (his 11+ result was 'borderline'). His education was dire, dire, dire.
Upstream, someone has said 'Why can't SM teach better, like grammars? Well, several reasons. First you'd have to define 'better'. Many of my teachers at my GS would have been eviscerated in a SM classroom, or even quiet a few modern comps! But we were all a) bright enough and b) smart enough to recognise that we could be selected out; that our future exam results and onward 'glittering prizes' was dependent upon us alone; and we all sat in classrooms with other DC of a similar, narrow intellectual ability in fast paced lessons tailored to us alone. A SM classroom at the time held the DC who got '79%' at 11+ (80-100% having gone to the GS) and DC who maybe got 10%, DC with quite serious SEN and SN, DC with serious behavioural (and social) problems. The 'one size fits all' of the GS classroom would have failed miserably in that setting.
There was no movement whatsoever between the schools (OK, I lie- 2 DDs left my GS to go to the local girls' SM due to persistent poor behaviour!).
I just can't see why all the DC can't be at the same school and have their lessons differentiated according to ability in that subject. That way the DC learn to rub along with all sorts in their day to day dealings with each other but get taught lessons in an appropriate environment. You don't need to put a chain link fence around that building to achieve that.
As for the stats, well, taking 100 DC, if 20 go to a GS and they all get the Eng Bacc; 80 go to the SM and 30% get the Eng Bacc, overall 50% get the Bacc. In the comp setting, using these stats again, 50% will get the Eng Bacc. When it comes down to it, if Emily is child 81 or child 79 she will get the Eng Bacc. BUT if Emily is child 79, her SM might not even offer the full range of Eng Bacc subjects; she may find herself in far more educationally diverse groups (often in a smaller school, these days, with fewer opportunities to differentiate the DC through streaming). Her classmates may include several with complex educational and social needs which the money isn't there to address. The expectation upon her as child 79 (SM) will be very different to that of child 81 (GS). So her Eng Bacc might have to be harder won than if she'd been child 81 at the GS.
How's that fair?