>Student populations have a fixed number of grades awarded every year, etc. Yes, for the national cohort. This is different, the predicted results were weighte

>Student populations have a fixed number of grades awarded every year, etc. Yes, for the national cohort. This is different, the predicted results were weighted on a per-school basis. For example, a particular child taking, say, a history exam, in a school which had previously had no pupils that achieved A* in history over the past four years had probably no chance of getting an A*, even if that was their teachers' prediction. Purely on the basis of which school they went to. A weak cohort (compared to previous years) at a good school would be upweighted.