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I would like to know if I would have sufficient grounds for appeal
You are free to appeal on any grounds you want. Some parents appeal because they want to find out what an appeal panel thinks of their case.
Or it may be because they want to be satisfied they have done everything possible to try and get a place.
To stand (any) chance, I think the academic evidence would need to be really strong. Not just "exceeding" but "greater depth" in reading, writing and maths.
Appeal panels are unlikely to accept the reliability of mock tests.
For more on academic evidence see:
https://www.elevenplusexams.co.uk/appea ... cation#b11Quote:
believe that he may be dyslexic and gets very anxious although this has not been officially diagnosed
It might help if there were proof of previously undiagnosed moderate to severe dyslexia.
And would the primary school confirm acute anxiety?