Please help. I’m an NQT back from mat leave. Behaviour at my school was bad before I left, but now it’s terrible. For some classes the behaviour system is completely ineffective. The threat of a detention, any sanction, or being kept behind for time wasted is dismissed out of hand. Waiting for quiet or counting down is ignored, as are seating plans. Shouting is not heard. Reason is dismissed. I can’t send them out, they just walk out anyway and return at will. A couple of pupils are aggressive and even if they are removed, they leave isolation and return. There are gangs of kids just roaming about school and causing chaos. Even the well behaved kids are joining in and I had a lesson on Friday where I could not actually teach. This starts outside the lessons and spills inside. The carefully planned and differentiated content on Friday was not relevant because the kids were just running about and chaos ensued. I’m sure if I had more presence and experience I could deal with this, but there is also an element of this being an exacerbation of problems endemic in the school. Any help is gratefully received. Thank you.