foundation tier gcse maths

[kilmuir]

trying to get as much info as i can. what percentage correct do they need, roughly, to get a grade C?
Is the work assessed at the end of year 11 or is it ongoing?
We have a parents evening in a few weeks and trying to be prepared

Depends on the board but roughly 70%

There will be two exams, a couple of hours each, one calculator and one non calculator, both sat at the end of Y11. Maths doesn't have any coursework.