I honestly think some schools have seen it as an opportunity to big themselves up, potentially give their students a leg up and perhaps go to a university they wouldnt normally consider. That has spolit it for the rest of the schools that are trying to do the best they can.
The fantasy grading has resulted in all of this. If they really have some A* student in an Inadequate school (and I think there are very few students with these circumstances) then prove it, bring out the mocks, the reports, and evidence and then you have a much stronger case. However if you have no evidence and excuses for everything you are asked for surely you cannot blame the boards for letting the grade lie.
However if you really really think its not fair, do a gap year and then take the exams either next year or in Oct.