I would like to know how to get DD motivated to revise, because nothing I have tried will work.
I have one who won't revise & one who won't stop revising (yes, honestly, sigh).
Won't-revise: he does make good effort in class, at least. Below comments he doesn't argue with. We long ago stopped his pocket money, btw.
People will think you're thick if you don't do A-levels, or go straight into the military. Be prepared for that... and work harder if you don't want people to think you're stupid.
If these are the ONLY qualifications you ever get, then make them good ones.
You MUST get >= C in English & math for almost any future career choice.
If you aim for Cs you might get Ds. Aim for As hoping the worst you'll get is C/B.
The path you say you want requires X results. If you don't get X, then I don't believe you ever really wanted that path. So what other future options do you want to talk about? What's your Plan B?
Aren't you jealous of your friends going off to get jobs & university & doing stuff?
So, What are you going to do with your life?