To seek help for teenage son

[Teacupover5]

14 year old ...very badly behaved at school
Tried everything ...chatting ,loving ..tough love .I work hard and he has a lovely life .
Nothing works .He is on the point of being permanently excluded but doesn't seem to care .

Nothing diagnosed but I know something is wrong with him .Cant make the connection between behaviour and consequences .
Any help please am at the end of my thether

Is he doing well at school in terms of academic achievement or struggling? The reason I ask is that I think some kids don’t enjoy school and misbehave if they are struggling with the work and doing badly. The solution then is to get them extra help to get back on track.

Is his doctor aware of the problems?

Speak with his instructors first ... Try and gain some insight on what he is doing "wrong" and ask them they notice about him. Then, you should try and speak with either a doctor or a therapist regarding your options from there. It could be a "teenager" thing (my son who is 16 has some of the same 'issues').
It may not be your fault or his fault but something out of your control. Best of luck, x.