No plan here, as yet. (Sorry, I'm a very latecomer to this thread but have been lurking a few weeks!) We really need to sit down and hash something out but I don't want to alienate my son.
My son is academically very capable but hangs out with a peer group who are downright freakish in terms of ability and therefore he often feels very crestfallen at grades that fall short of his friends. (they can rub it in, too...) So there's that...
But I think he's also fallen victim to the praise heaped on him by teachers at parents' evening. They like him, they predict great things. Then his second lot of mocks results start coming in and they're quite a mixed bag. I'm concerned that he's been getting quite cocky, trading on the 7/8/9 predictions and not doing anywhere near enough work to sustain the momentum. He gets very stressed about all this so a light touch is needed, which I don't always manage, and he self-regulates and destresses with his hobbies (Warhammer, watching favourite tv/films online, arguing with mates on Whatsapp...) That's fine but I think he disappears up to his squalid bedroom to 'revise' and is actually painting models most of the time! He also gets very prickly if I suggest he should be doing more revision at home, as 'it's ALL we do at school now!!' - true enough, all his lessons seem to have been revision sessions, exam techniques etc since at least Christmas. Very little actual new content this academic year 
I've started getting some revision guides - did we leave that rather late?? he claims almost nobody at school uses them, but was very grateful to me for getting the History of Medicine one as that's the weakest area for him in History. How do you decide which one to go for (obviously you pick the right board but there are often several options from different publishers)? I used to revise by reading my class notes/text books, then trying to make concise notes on cards or notebooks. He claims this 'doesn't work' but I'm gently pushing him on that as I know damn well that writing things down really helps to consolidate in your mind.
I think if I suggest he should aim to do at least 4 hours a day over Easter he will explode at me!