Let's bring a bit of perspective to the last 20 or so posts. Our dd was initially sent to a top 100 comprehensive. In the first two years there was massive disruption by about 6-8 girls and their hangers on. Intimidation, theft, bullying, assault, fighting, effing and blinding at staff. DD was not personally involved in any of this or targetted by them but became so frightened and scared and disillusioned because of the failure to deal with poor behaviour and with being unable to learn she self harmed and stopped eating.
The school said there there it's normal behaviour in Y7 and she's led a swaddled middle class life at a nice middle class primary - and chose her for lots of things in Y7 and the begining of Y8. The behaviour of those girls was allowed to escalate throughout Y8 and some very serious and dangerous things happened but the school did nothing apart from a a few fixed term exclusions. Those girls are in Y10 now and nothing has been done yet the behaviours have deteriorated - in total the school has lost about 10% of its highest performing girls in that cohort to the independent sector.
We are very lucky, we had the money to move dd and did so from the start of Y9. Our daughter is now happy, achieving, confident and challenged. The school also has serious consequences for seriously bad behaviour - oddly there isn't much.
The saddest things of all is that dd made some lovely friends at that first school who were not materially privileged whose parents cannot move them and they are stuck there and possible will not achieve their full potential because too much teaching time has to be spent on behaviour management and I say that unreservedly as the school has dive bombed in the league tables.
Different schools suit different children - one size does not fit all and there have to be choices beyond all children attending the local school - all children are not the same.