The French summer holidays really are very long, and children are expected to work their way through books like this to keep up their knowledge for the following year.We've done them in the past, but this year I'm on strike (how very French of me). Son 2 will be redoubling, so hardly needs to revise what he will cover again next year, and Son 1, well, I don't know, I'm just giving him a break, too.
So instead, to keep them on their toes and pick up their English (of course, they are almost the only bilingual children I know who don't get formal English lessons, as I'm the local English teacher), they have been allowed to choose a writing book each and write about a page a day. I then read their writing and tell them three things about it that impress me, and three things they could learn to improve the next day's writing.
Son 1 has finished a series of chapters on Egyptian myths and the relevance of ancient Egyptian culture on life today. He's now heading off onto a discourse about black holes and Einstein. Son 2, just to prove that you never get two the same, is writing me a little letter each day, and telling me about his thoughts and experiences. I can't tell you how much I am enjoying reading both books, daily!