Our expert says:
How alarming this must be for you ! Its puzzling that the teachers didn't contact you before now, as whatever these troubles are were building up for some time. As you note, the striking difference between his excellent conduct at home, and his bad behaviour at school is puzzling. Best bet would be to take him to see a good local psychologist ( maybe the school can recommend one ) depending on the boy's age, either a child psychologist who would be fine as they work with kids up into their teens, or an adult psychiatrist who would start with teemns and up.
There would appear to be a need for a proper expert assessment to discover what has been going wrong, which would provide the basis for planning what to do about it.
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