What is fascinating about the question of whether private schools offered a superior service during covid is the assumption that "of course they did".
If you look at the graph comparing top grades year on year, it is interesting to compare 2019, the last year of exams, with 2022. We know that top grades have increased since then.
Academies: 23.7% to 35%, a relative increase of 47.7%
Comps: 20% to 30.7%, a relative increase of 53.5%
Independent schools: 44% to 58%, a relative increase of 31.8%
Wouldn't we expect that if private schools provided the best online provision and the least disruption due to covid that they'd have made a bigger, not smaller improvement in reaching those top grades?