Came up in conversation with one of my kids' teachers who is getting the other child next year. Their plan currently is to teach through the missed end of the previous year's curriculum, hopefully at an accelerated speed, and get back on track at some point. There was no judgement, just a matter of factness that they're going to have to cover the content somehow - some of it will naturally be picked up on the next repetition through the topics (seems to be Shape Space and Measures season that's been lost by most schools in particular) but schools are pretty aware of it. I know our junior head will be formulating a million alternative plans of action depending on circumstances right now... the infants seem to be producing a bajillion pretty looking bits of paper and huffing and puffing about everything (which has been their style throughout the whole thing though).
The trouble is - lots of the time they use for intervention work, and picking up kids who've struggled with a lesson concept is during assembly time where they'll keep a handful they want to target back - and of course... no assemblies. That's a fairly common system in most schools I've been in - Maths followed by a mid-morning assembly where the kids who haven't quite got it get followed up again with it with the teacher and TA.
Until mine went back into school I was running myself ragged trying to plan and keep on with the curriculum - now I've realised that the bulk of kids will be in the same situation and schools are just going to have to work with it and backed off a bit. One of mine will be fine - cruising along near the top of the class naturally (she's like me - the academic bit is not hard for her) but the other who has to work to just about hold level is probably going to have slipped back somewhat - but I had to take the pressure off, and send her back into "childcare" format school to protect her mental health as she was really struggling. The academic damage can be repaired over time much easier than a 7 year old slipping into depression and anxiety from the isolation could be.
Can't see setting and streaming happening when it doesn't already as it'll be additional mixing of bubbles. Schools are just going to have to cope.
Like I say - I was chatting with the class teacher and they've had families not engaging at all - through to parents who have done the work FOR the kids - and then a few very self-directed individuals who've blasted through it and requested extra modules released online for them to do as well. Pretty much the same everywhere I think - then the keyworker kids who've had some time directed for them to do the school online learning during the day in school, and then spent the afternoon shooting basketball hoops and scooter races across the playground.
My youngest in keyworker provision seems to have just made a load of junk models and her teacher's entire recycling bin and stash of Amazon packaging from the lockdown internet shopping seems to have been fobbed off skilfully into my recycling bin!