I do agree with PP that yes, years 7 across the board have fallen off the bottom of the scale in terms of behaviour and maturity, and that appears to be country wide, and yes, that might not in fact be directly related to covid - not so much what they lost, but more that they have been hugely over compensated. They are infantilised beyond belief.
I could sum it up with one boy, who on the first day of year 7 took his blazer off and handed it to me to hang up. I thought it was weird, but it was his first day of secondary school, so I imagined he had just forgotten himself, and did it for him. Then on subsequent days it became apparent that he genuinely thought this was the teacher's job. It didn't seem to occur to him that there are 30 children in the class, he literally can only see his own individual requirements, and expects and demands that they are met, and is entirely uncomprehending when they are not.
Now imagine in each class of 30, I have 15-20 students like that..... ( I have 5 year 7 classes) and I am in a MAT of 10 schools, and teachers from all of them say the same...
It isn't poor behaviour as such, it is a total blindness of what normal behaviour is. Others screamed and yelled, and stood up and danced, throughout the first months, not to be rude or disruptive, but because they genuinely didn't see why not, and had no understanding that this isn't how you behave in a classroom. Others have to be told repeatedly not to do something, like "Michael , don't pour water over your desk" so he stops as you are looking at him, but as soon as you turn your face from him to continue to speak to the class, he is doing it again, so you tell him again. And again, And again. Literally the same instruction 5 times in 5 minutes, and then you send him out and he doesn't have a clue why - not a clue. Hes like my cat.
I don't know how much of this is covid related, but I have never known anything like it. You do get year 7s become arrogant quite quickly, particularly in bad schools, where they copy the older children. But I have never known a cohort of year 7s arrive behaving like animals in a zoo, no impulse control at all, zero, no concept of what behaviour should be, none what so ever. They have improved as the months have gone by, but literally it was like taking on classes of nursery children and teaching them how to behave like normal 11 year olds.