Primary school - mainstream. Not enough support staff for those kids with SEN. Usually a class has a teacher and a TA, but if TA is already supporting one child with challenging behaviour (and had to remove them to work independently outside as they are 2 years behind) then the other 3-4 that also need support don't get it and they can then proceed onto low level disruption. This is day in, day out, and the teacher is aware that they have to show progress for each child in their learning. It is an impossible task. SEN or AEN - ranging for ASD, ADHD, Dyslexia and Processing disorders, can be observed in many classes of 30+.
Behaviour deteriorates when there is any change - so if a teacher is off sick, it's a struggle with a cover teacher. If it rains and kids have to stay in, again it's another change and behaviour deteriorates.
Interesting exciting lessons is what we want to do, but some children cannot deal with the excitement or stimulation (sometimes because of SEN). This can cause behaviour to (generally) deteriorate.
We have children whose families are on the SS radar. Some families will engage and support, but others will not as they are suspicious of anyone in authority and defensive when you want to discuss their child's behaviour with them.
A lack of funding, and a lack of support from Govt to LA means the school can only do so much.
I'm not sure what the answer is.