Hi @whistl from what I read it looks like the average of all of them and I didn't see anything relating to a one sitting criteria. Having said that, I couldn't find a web site that explained everything in black and white. I think I kind of understand their logic if my interpretation of what they are doing is right (and that's a big IF).
I saw some graphs that showed the percentage of students who got an A, or a B, or C etc in History who had an average GCSE points of 6.5 (like a GPA in USA). It then had the same graph for students who might have an average of 6.5 but a 9 in history.
It then had a further table that applied the inherent aptitude test results over the top. Then a table that had grade probabilities based on a student with that profile taking combinations of subjects.
The thing I was looking at was pretty much raw data.
It's interesting because gcse results don't take take into account whether the student busted a gut to get the grades. Applying the aptitude results would (in part) Level this out. So a student who worked really hard but had no aptitude in a subject would show up and vice versa. If A Levels are harder and the student worked every hour under the sun to get their GCSE results then their A Level grades are going to be lower because there are no more hours in the day to maintain their grades. This would also deal with the subject plateauing issue. It could also show the probability of a student having done poorly at GCSEs, had the shock of their lives and then some, but not all, will pull their socks up. So some will still get an A but the majority don't. That can also be deduced from the table. What you can't tell is whether a particular student will fall into the category of pulling their socks up or not. So if there's a mismatch it will show that they could get an A if they try hard but will only get a D if they carry on with their current effort level. So I guess that's where the teacher moderation comes in?
I also saw a presentation slide on interpreting the results- one made me raise an eyebrow. It had a spike in the raw Maths aptitude test and then an annotation that said "Asian? EFL?" which would also tie in with the personal information form.
All a bit big brother!!
Mind you I would be fascinated to see DDs data but that's from the perspective of nosiness 😀