Welcome!
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Could you comment as to how relevant you think this might be with a 120.75 score (which is surely its own form of academic evidence) and whether I should make any comment about why she dipped in maths in years 3 and 4 (headteacher has not)
I think it's worth a very brief mention - not because you need to explain the shortfall of 0.25 of a mark, but because it might be a wise precaution to pre-empt any doubts about your evidence for Y3-Y4.
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and another question - is there a way I can check what the school predicted/the accuracy this year (and previous years). I know I can't do anything about it, I'd just like to know.
The headteacher should have all the data, but many heads seem reluctant to part with the information!
Admissions also hold the data, and will make it available to the Review Panel and (in the event of an appeal) to all parties at an appeal hearing.
You could therefore try requesting the data from the Freedom of Information Officer, Bucks County Council.
See the example here:
https://www.elevenplusexams.co.uk/appeals/general#a39(N.B. They normally have 20 working days to respond to a Freedom of Information request.
And the request could be refused if the numbers at the school who took the test are so low that individual children could be identified.)