The primary school my kids attend has a number of children who may or may not have SEN but are often highly disruptive because they attend school irregularly, have unstable home environments, and lack discipline. They come from a minority community that struggles to provide behavioural boundaries.
It is really hard for these kids to adjust to an institutional environment where they are expected to sit still, do as they are told and so on, when they do not have these expectations at home.
Some of the time the parents can be brought on board some more but sometimes they can't, because their community does not really value education at all, and it is kind of amazing the kids are there at all.
The teachers are doing their best, but don't have the resources to deal with it optimally and classes are already big. !any will leave primary school all but illiterate.
I still think these kids should be part of the class but with extra support for everyone while they are struggling. Which is for a long time. The whole class does 'suffer' while these kids are learning, but what is the answer? More resources, more one-to-one support, more inclusion.
The school does get extra resources for children from this community, but as far as I can tell it is nowhere near enough for the challenges presented. Sometimes the Year One children get sent back to Reception for a while, for instance, because they just need to learn to meet certain expectations before they can learn at all. Obviously if they had fully-fledged SEN, I assume this would not be appropriate, although I don't know enough about it.
To be honest, the more I see the huge, huge range of children in a class the more I am astonished that teachers manage at all. What a challenging job. I am so glad I'm not a teacher and I'm not at all surprised so many leave the profession.