Laniakea - wow, that sounds like your dd is working really hard! Well done to her.
DS has not done much revision AT ALL since going back to school! 
Excuses include:
Monday - first day back
Tues - too tired, because of first day back and early morning
Weds - had been to history after school
Thurs - we had a long chat about revision, which in his world, 'counts as revision.'
TBH, after last nights chat I think he is feeling a bit overwhelmed with it all - he has so much to do, he just doesn't know where to start!
He lost his chemistry folder, which had all the questions and info needed for his controlled assessment and also couldn't find his history folder. He had looked 'really hard' and was stressing about how to approach the chem teacher about it. Of course, when I went into his room to look, I found both on the window sill!
He did say that his chem teacher was 'useless' last night. Apparently, some of them wanted help with their CA at lunch time but he got cross saying they should have listened in class and he was only going to be there after he had eaten, giving them only 15 mins at lunch to get help, which seems pointless! So different to his physics teacher who helped him so much he got an A for this CA.
And the extra history class he has been going to was run by a different teacher last night who totally confused him. He has been really positive about these classes, so much so that he is considering history for an A level and has said he really enjoys it. Well, this teacher said that A level history is really hard so that put him right off
And she taught it in a different way that ds didn't get, so he tried to 'not listen' but then got told off for not paying attention. There were only 2 of them there! I've told him to go and speak to the usual teacher about it but he is going to wait until next weeks session and hope he is back.
He did his first extra maths lesson after school last night too and there were 60 of them there!! I'm hoping these sessions will bring him up to speed with maths. I also emailed a local maths tutor last night, starting the road to finding one who can help with his confidence in maths.
And finally, I have spent all afternoon finishing off the revision planner on 'Get Revising' - not 100% it will work tbh. But we'll give it a go. I also did a 'mock' revision timetable on paper for him - I used A3 paper, colourful sharpies and made it really clear to follow. Got quite into it really 
DS hasn't looked at it, is totally engrossed in his PS4 and refuses to engage as 'Fridays are his day off'
Arrrrrrgh!!!