I have an acquaintance who attended an inner city comp (not the worst) and teachers were always touting her as extremely bright as they have a positive ethos. The acquaintance is probably bright compared to their peers but at GCSE she gained 18, a couple of 7s and the rest a mixture of 6s and 5s
Teachers at the school were encouraging them to try for Oxbridge as she was one of the brightest in the school.
Are there a few teachers that aren't really aware of grade inflation and don't look at nearby grammars and private schools where strings of 8s and 9s from the brightest are the norm?
Is it a little cruel to over praise results!