See, that would be an example of ill-informed teacher-bashing.
The grade boundary between B & A/A* is just as important, as a measure of teacher's performance, as the grade boundary between D/C.
I have no idea where anyone gets this notion that it's all about 'grade boundary kids who make them look good'. I've never met a child who wasn't a 'grade boundary kid', if by that you mean one who needs teacher attention to hit their upper quartile target.
Also, our cohort is streamed for English/Maths/Science, then set within those streams for individual subjects. If you've got the group which is 'best at your particular subject, in the lower stream', you are very likely to out-perform the group which is 'in the higher stream by the skin of its collective teeth, least able in your particular subject'.
Yet the first group will have lower targets.
Honestly, Chloe74, you over-simplify, because you are poorly informed. Precisely as I would come across if I tried to pontificate about hairdressing or midwifery or bricklaying or astrophysics.
Although why I'm bothering to engage, given your last sentence, I have no idea.