A new report finds HMYOI Werrington, a young offender institution in Staffordshire, to be improving in many areas, with good care for the children detained, but high levels of violence remain a challenge.
A culture had been established whereby there was an obligation on children to fight with children from a different postcode, gang or wing, inspector found.
HMP & YOI Chelmsford was found by inspectors to be a violent and unsafe prison, with large volumes of drugs smuggled in by the many organised crime gang members in the Essex jail.
HMYOI Brinsford must address a "dreadful" rise in self-harm by young adult prisoners and change a regime in which they are locked in cells for long periods of the day, according to prison inspectors.
Inspectors found Cookham Wood young offender institution, holding 161 boys, to be less safe and more violent than at the previous inspection in 2016, with little evidence of an effective strategy to reduce violence.