Get him into anger therapy or a marital art. He is displaying whatever is going on with him emotionally as anger/aggression and this is very bad for him and everyone around him. The school is limited to what it can do so you have to figure things out until you understand what the root cause is. Until any qualified specialist is able to get to the root cause of his difficulty and what he is going through you won't stop the behaviour.
IMO he has been left a long time 3 years to further ingrain habits and with an inconsistent approach, school, punishment, withrawal of privileges and then reward for good behaviour. One consistent approach usually works better with kids, of any kind. The most damaging thing I have observed over 35 years working with parents and families is that they take a throw everythign at it approach and the child doesn't know what to expect from any of it.
A lot of kids who go through challenges in teens, it starts as resistence to rules and trying to be their own person. Your son is seeking attention in some way or another but you don't know why or for what so I always tell parents take an honest look at how you do things first. See if there are patterns that have developed, keep a diary about things that happened and your response because its easier then to understand if you have changed as well and how.
Even if his behaviour is bad, which it is, the reassurance that comes from consistency that he can judge your reaction is critical for him learning to manage his own behaviour. Logically if you are him and one time he does something he gets (a) response and another time (b) response I'm sure you can understand it is destabilizing and nobody wants to live their live in a "what if" loop. Certainty is what breed confidence in people and that comes from consistency.
You need a collaborative approach with all parties (school, family, you, etc) clearly stating up front the "rules" of play if you like so that he knows the consequences of his actions before he takes them and is therefore not surprised by any response. In addition it cuts the "attention seeking" part from the outraged responses he is currently enjoying because different things happen in different scenarios. Without attention for negative behaviour or with consistent consequences, children can start to self-regulate what they do and eventually over time learn to talk to you instead of lashing out. He has everyone in fear and that is getting him attention.
Eventually the behaviour should begin to adjust. Its a slog and its hard, and you are clearly going through it, but I'd examine your own responses, and IMHO unconditional love and consistent patient responses with a very regulated reaction e.g. not just one day he is being good so he is rewarded and then you get busy - something comes up so he craves attention and gets the desired negative response. For kids, negative or positive attention is irrelevant its just attention - one way or another and whichever gets him the most, he will keep doing.
I've never seen success from anything else other than consistency 100%. Which means that using the withdrawal of the holiday to him is a 100% message that you only want him around when he performs the way you like or want. This will cause further resistance and playing up will escalate. It's your choice but it is an expected reaction from your son.
Try and take a perspective from his side and I'm not saying condone his behaviour but if you were him and the one thing you were looking forward to is taken away what would your reaction be? He doesn't have the emotional equipment to manage his responses - so he needs to be taught this. That's why I suggested martial arts. They are highly disciplined as well as being an outlet for built up energy which manifests badly in him. If he bonds with any organisation that teaches him that controlling himself is powerful, things will slowly change but you have to support this positively in the knowledge that setbacks will keep coming hard and fast until the new learning has become unconscious and that takes time but keep going!
I'm not saying tolerate danger in your home and fear in your other kids, but so far in his mind the benefit of behaving well is way less than what he gains out of not doing so. He needs to see you are still interested in helping him however he tests you and that you have not "given up" or told him that you have.
Something he has not learned yet to control is exasperating his behaviour, making him do these things, so starting with a how can we get to the why, (which you will need help doing as he is unlikely to share anyting in a resistant state), is better than penalising IMHO. Good luck.
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