I have two Y9 classes and 2 Y8 classes. Y9 bottom set: somehow I have managed to deal with their poor behaviour and now can "work" without too many behaviour incident. The other group, mainly girls, forms the pack girls. I have observed them in other subjects and they behave "ok/very good". Y8 are just awful and arrogant. Because the HoY believed a student's lies (until my HoD and I gave her evidences of her lies), this group persistently misbehave and do not take things seriously anymore. Oh, the teacher who was in this school before, used to cry in front of pupils and was bullied. She, of course left the school, and now the students have decided it was my turn to cry. It will never happen, believe me. They are still asking me, miss are you going to cry? (With a nasty smile). My HoD says that these groups are "disgusting"! Now my question is how can I improve this situation? I want to start again with a good and fresh behaviour management after Christmas but I want to prepare a good learning environment. No matter the seating plan, no matter the sanctions, they ignore the rules as soon as they arrive in MFL department. Although I was told to carry on as it was better and they could see the improvement. But to me it is not acceptable to raise my voice because they want to set their rules! Any tips please? Oh, I am an NQT your helps and advices will be much appreciated, thank you.