Teen,
Your last post is basically admission that you have no answer, no argument to put forward. You have nothing but labels and other peoples supposed titles to hide behind.
My argument is far from incoherent, this is why you call it names, have no answer and don't engage with it.
Your experience as you described it does no favours to the sets system, as I discussed up thread.
If your DC is so extreme that they require 4 or 2 hours for every 20 min that other children need, your DC is outside of the range of ability that can be educated without sets, in mixed cohort. An outlier cannot justify sets for everyone.
If your DC has average ability, than with the right provisions he would not require 2 hours for 20 min and should be able to do good GCSEs. In that case he should not sit in the bottom set. Your experience just doesn't add up, probably because your example of 2 hours is a construct for the sake of argument. The reality of your DC experience is more complex and nuanced. You advocate sets because this is what you know, what is available, or what you choose for your DC. It does not make it right for everyone.
I discussed the point about 35% early in the thread in page1 and 2. You did not engage with it.
Yes, norm reference is part of the problem and of course it needs to be looked at and revised as part of broader change. The basic fact is those 35% can't answer enough of exam questions. They don't score enough marks, because they were not educated to the required standard. Setting contributes to such low standards in the lower sets, poor outcomes, this is why it should be scrapped.
Have they been educated to the required standard, there would be huge pressure to adjust norm referencing, so that 90% would get grade 4 and above and not 65%. But first, those kids need to master the basic stuff for grade 4.
I say 90%, because just as an example, 90% of the French (and probably 98% of Finns) pass the equivalent of GCSEs, and Brits are not supposed to be less able... Do you follow?
You cannot explain these poor outcomes away with low ability because in other systems students with similar ability, from 10 to 35 percentile achieve better equivalent outcomes. So children with this range of ability are capable of better, it is the system that prevents them from achieving.
The point is only bottom 10% of population really have low ability.
Average ability starts at 25%tile, so 35 takeaway 25 = 10% of kids have average ability and don't get grade 4 and above. This is wrong.