What did they use for predicted grades? Just year 12 exam performance? My son's sixth form state it is a combination of homework performance, ie how much are they getting correct, class participation, end of topic tests that they do in class and their year 12 exam results. Ds had year 12 exam results listed and then predicted grades but they were given separate grades for maths and further maths.
I think the general rule they go by is if they are performing at an A star level in maths (they do all the A level content in year 12) then they can have a predicted grade of A star for further maths however if they are performing at an A grade level they get a B for further maths. For Ds when he looked at his year 12 maths paper he made stupid mistakes ie misread the question so it isn't a lack of knowledge or understanding, it was stupidity. Can your son identify where he went wrong on his papers? Are his scores actually percentages?
I would go into college and talk to them. UCAS deadline isn't until January so he has time to prove his grade as they will no doubt be doing more tests. I don't believe school just shrugs, your son has probably been told exactly what he needs to do. He just might not be an A star student for maths. At this point some students crumble and just accept it or they work hard at improving and demonstrate their commitment going forward. Of those with 9s at GCSE for maths just under half get an A star at A level, just over a third get an A.
University entry grades are the entry level meaning there will be those applying on higher grades and your son is aiming for the top universities. @dazdaz2 Ds did the TMUA but it was for Cambridge so CTMUA they get given the scores because they pay for it. I don't believe that score is shared with any other uni. Ds's personal statement was in before the test as he was an early entry October deadline and the test was beginning of November.
@happyhippiehippo @Nottscatering at Ds's sixth form it is called "attitude to learning" and they are graded on it. They state successful students do the following - high levels of attendance, active in lessons, high levels of commitment to additional study (there is homework and then a voluntary push yourself part too) and that they seek help when they are unsure or need guidance. The top grade for attitude to learning says it is a student who displays exceptional levels of enthusiasm, curiosity and self-discipline. They are highly organised and always meet deadlines. These students show extraordinary commitment to additional study and assessment preparation. They constantly challenge themselves to improve.
There is also the college ethos for which you can score positive points for (and negative) so arriving on time, dress appropriately, positive attitude in lessons, respect other students and staff (the list is long) and yes this is a state sixth form, outstanding, oversubscribed but their entry grades are 5 x grade 4s. They want to improve every child and give them opportunities. It is a incredible place.