6th form - parental involvement

[Thatisme]

My DC is doing GCSEs this year and it's being a very rocky ride, not so much academically but mostly due to attitude and behaviour. I'm exhausted and all I do just backfires massively. Not a single day goes by that I don't receive a call or an email (or more than one a day) from the school about it. So, my question is: what sort of involvement do parents have in 6th form? Because I cannot possibly continue this way for another two years. I want my DC to grow up and take responsibility over their poor choices. Right now it feels that I'm paying the price. Can I just leave them to it? And if they mess up then it's on them? I know my DC should care about how much stress they're causing me but they couldn't care less so I need to take care of myself.

Have you had formal meetings with the school and your dc to make sure that you all know the whole story and are on the same page?
Is the school's support system involved productively or is this seen as purely insubordination?
Does dc have any underlying issues or challenges which could explain this?
IME kids are complex and their problems can stem from a large number of things.

Also your dc might be meeting the need to get attention. I'm not a professional but I know, as a mum, that 'acting out' would usually be meeting a need in the child?