I've given up keeping up with this thread, you are all so prolific!
Anyway, DS3 is doing his 4 x 1/2 hour revision slots a day quite happily. I've bought him a CGP workbook for maths that's 8-9 questions in the hope that he can raise his predicted grade 8 or at least maintain it.
He's just had an offer from the local good comp sixth form of 33 points from his top 5, so average of 77766, needing a 7 in maths, a 5 in either English and 6s in chemistry and computer science. He should manage this so hopefully sixth form place is sorted. He wants to do FM and his own school sixth form only have a very few DC taking it, which gives small class sizes but very few potential friends in lessons. E.g. Only 3 or 4 doing FM with the same DC in the maths set as well. Not quite the sixth form experience we'd hoped for. It's still his back up plan, though.
Hope all your DC are coping with the slog.
I've already bought a clear pencil case with spare pens, pencils, rulers etc. Good point about a spare calculator, might borrow his brother's.