Yes I saw about the legal challenge and wondered if it would mean a lot of schools would now have to change their rules
Based on what I have seen so far, I doubt the legal challenge to St Olave's would have succeeded if it had gone to court. The lawyers acting for the parents were arguing that kicking children out after the first year of a two year course is an illegal exclusion. If the children were of compulsory school age they would have a case. However, once you reach sixth form you are no longer of compulsory school age. I would have expected the school to argue that it has simply set entrance requirements for the second year of sixth form and the pupils have failed to achieve the necessary standard. If they put forward that argument I would have expected the courts to back the school.
The logical extension of the argument put forward by the parents in the St Olave's case is that schools would have to admit all Y11 pupils to sixth form regardless of their GCSE results. I think the courts would recognise that as clearly ridiculous.
If the parents had argued that St Olave's was setting an unreasonably high bar for entry to Y13 they might have succeeded but, in my view, the illegal exclusion argument was bound to fail.
Dollytwoshoes
If she got a U at AS level I am not surprised the school don't want her to continue with the subject. I don't think the St Olave's challenge helps you. And it is unlikely you have a case against the school regarding the grades given by your daughter's teachers. Rather than going in with all guns blazing and talking about legal challenges, I think you would be better advised to point to the fact that she was a B grade student, say that she didn't take this public exam seriously (which, I'm afraid, was rather silly, to say the least) and see if they will show some leniency.