I also had this at my school, a highly regarded anti bullying school...that was rife with bullying. The school was absolute chaos, the trouble makers ruled the school and the kids bullied and harassed the teachers. There were hardly any lessons, the teachers couldn't control them, lots of them left and had breakdowns and nobody gave a shit because who wants to learn or be that one that speaks out.
The worse behaved you were, the easier it was. The really bad ones didn't even do school. They sat in their own naughty isolated class...that went paintballing and got McDonald's.
Every oftsed, all the worse kids got taken out for a day trip and the rest were put in their place through assembly and with rewards promised for good behavior.
Everywhere was spot cleaned, new signs and posters, school uniform enforced when it wasn't before. Fake lessons, questions back and forth rehearsed solely for the benefit of the inspectors.
We would say, it's all bollocks it's not like this, nobody believed us.
The whole while all the parents including my own thought it was some amazing school. It was notz far from it.