I'm plodding on with a y2 and y4. It's been a battle from the start as DS1 has SENs, he is bright, but dyslexia and dyspraxia take his toll and autism affects perspective, patience and problem solving. Meanwhile DS2 is not the world's most mature learner. Possibly dyslexic too but not to the same extent if he is.
I've had better results from y9 set 4 on Friday p5 
We've tended to ignore school's work and go for Bitesize. The interactive games and videos suit them and they like the format. They get intimidated by longer open tasks. School has now switched to a weekly project and I thought that more choice in that would work better, but they favour the short structure of bitesize.
I find a one hour blitz each day works for us. It's too hard to herd them up and remotivate them to do multiple sessions (I tend to be better at blitzing in one go and find recovery from breaks difficult)
I very quickly came to the attitude of keeping their brains alive with new information, and retaining skills like stringing a sentence together is enough.
DS1 was daft about the brackets work on the English today, but although it was silly nonsense, it showed he understood the point of grammar so let it pass.
I have to live with them 24/7 and we all need a balance between total neglect and apathy, and causing meltdowns and demoralising them by being too rigourous.
My PGCE is not being wasted, but strewth it's tough even being an experienced ex-teacher with reasonable resources.
There isn't a one size fits all answer, but it's worth chipping away a bit each day.
There will be children doing far less. I'd think many other than the most studious will be struggling now it's been so long since they were in school. Y2-5 have not got the most developed independent learning skills anyway (and from my experience of secondary, it's idealistic to think too many y7-9s have either).