Hi OP, sorry to hear about this. All is certainly not lost yet - the summer resit period has yet to take place.
If he gets his results on July 11th, this is because exam boards are now taking place, where marks are confirmed, and where staff work out which modules relevant students are eligible to re-sit in line with the regulations. So he’ll be written to when that’s happened, and he’ll have his options explained to him.
If at that point he still has questions, he should have a conversation with his personal tutor or course leader.
The advice you’ve been given on here to get him assessed / claim mitigating circumstances probably isn’t right at this point. A diagnosis and support statement could have helped him during his degree - it may have entitled him to extra time in exams or extended deadlines - but that can’t be done retroactively at this point. Universities are pretty good at explaining to students in year 1 that they need to get a diagnosis for a support statement to benefit from that support. Also with mitigating circumstances, the regulations will be quite specific about what counts, and it’s unusual to be able to apply retroactively.
All this is to say that Universities have quite complex and shifting regulations and procedures around resits and mitigating circumstances that have to be applied and stuck to (unlike what a previous poster suggests). They have to, to be able to award degrees. And their regulations have to be comparable to other institutions.
The good news is he will get the options around resits permitted within the regulations, and you won’t have to beg or plead for that. At the same time, staff can’t do anything outside the regulations, so there is no point asking for meetings with academics - they can’t change the regulations.
He will be able to access the regulations on his intranet, so it might help you to read them before he gets his results so you can understand what options he’s offered. He may be entitled to resits that could get him a pass. Even if he fails year 3 when he’s exhausted all his resit options, he may have enough credits for a diploma.
I see a lot of students sleepwalk through poor results and seem a bit shocked at the end. I’m not sure school is preparing them well for the reality of independent work and consequences. It’s really sad to see - we definitely want university to be a more positive learning experience than it is for some.