GCSE Revision - how much are your dc doing?

[Aftershock15]

What the title says really - how much if any revision are your dc doing at the moment or what is their plan.
Dc1 insists no one is doing anything yet, but not sure I believe him! He is fairly bright but not the sort that can get away with not doing any.

sulks and says she is too tired to revise most of the time

Bun this is DS too. If we left him to it, he would do nothing, though once he has finished he is in a much better mood.
He is just not the greatest scholar but fairly independent and motivated in other ways (has paper round and p/time job)

DD constantly listens to music via her phone whilst revising. We will see if her revision has been effective when she gets her mock results. She also chats to friends to discuss bits she doesn't understand.

MY daughter has found this Free GCSE Maths Revision Course that basically gives video examples of Grade C questions then there are questions for her to do and then she watches video solutions to the questions she's just done to check her answers. I've looked and it's aimed at the D/C boundary students. She says it's really good and it's free so there's nothing to lose  The link is:
https://www.udemy.com/so-you-want-a-grade-c-in-your-maths-gcse-part-1/