mmrz DS1 got given a breakdown of all his science mocks, and a colour coded chart of which questions/ topics he lost marks on - its been useful because like your DC, he is not forthcoming with explanations. It really helped target his revision.
He is a bit grumpy today, but he has said they are already adjusting his timetable to reflect upcoming exams - today he has an extra French lesson instead of Statistics, and after school French too - but no extra biology 
He is going to do some biology tonight when he gets home, but he plans to go to football training as normal.
So tomorrow its French listening, reading and then Biology. And it's his birthday - poor DS1!