Hope your operation goes well on 1st December MrsPnut and hope the mocks go well. I don't really get involved with DDs revision unless she asks for help. DS will be another matter as he does absolutely nothing by himself.
I was expecting school to put a limit on number of exams taken by nope Rollergirl and old school was similar, she was taking 10 gcses plus 1 AS level there and they were suggesting she add 2 languages, one was French which she did to y9 but the other was German which she stopped end y7 so a crazy suggestion. I told DD the German was a not sensible suggestion and she said no to both languages there which made sense as 11 was a lot.
New school she just seems to keep adding them and they seem super relaxed about it though I do wonder if anyone has looked at the total. The school did 9 out of 11 she was taking pretty much the same apart from history taught in reverse order and a few other things taught in different order. She is caught up on that apart from the one history topic so those 9 are fine. The new school do 10 and she could add Economics, that seemed fine as I have an Economics degree and we have always discussed economics a lot and she could catch up the year by herself or drop it if it was too much. Then she overheard school saying about after school gcse statistics so she said I will do that, add me and they did. When she went to that she discovered they did Further Maths after school so she said add me to that and they did. But the qualification was different so they said to her to do both the AS and the GCSE.
Then school sent me a message saying does she want to do GCSE French as well teaching herself as she has a French parent so you are a bilingual family - I said no as she has more than enough and we are not a bilingual family, only odd word of French (often a swear word from DH) then DD found out and got herself added.
At first she started mocks very anxious but now she is full of the joys of spring especially about the self taught ones. It will be interesting to see what impact it has on grades though also she has a change of school and teachers so maybe hard to know. She is very keen on doing ridiculous quantities of exams and I don't want to ban her but I do want to be sure it won't adversely affect her in any way. I am waiting to see how mocks have gone though I think decisions are made by school and her. It originally started off as she said she wanted to beat me. 
Sunflower I would love to be younger and healthier again as well. Having said that if I have anything will be glad kids are older.
StColumbo Great your DS1 is doing so well.