Thanks for your advice and encouragement. The programme specification for my son's course states it could be possible for him to be awarded a BSc if he fails to achieve the criteria for the MMath but this is at the discretion of the Programme Board and he would end up with a 2:2 at best.
Following the meeting with his supervisor he has become more positive and better understands the challenge he faces.
He has now locked himself in his room with limited access to technology and the internet (distractions), a years supply of Red Bull and a hotline to Just Eat.
The clock is running......

Hi,
My son is in the final year of a MMath with his thesis due in two weeks. He came home for the weekend has had a total meltdown.
It seems there will be no way for him to get anywhere near completing the work he has to do and doesn't properly understand the subject matter.
I realise the situation is of his own making but I am looking for advice on how to dig him out of the hole he's dug for himself.
So far we have told him to organise a meeting on Monday morning with his supervisor but if that doesn't go well I want to know what his options may be. would any of the following be possible/feasible.
Cashing in his points for a BSc
Postponing the thesis
Postponing and changing the subject of the thesis
Re-taking the entire 4th year and choosing a different subject for his thesis.

Any advice would be greatly appreciated.