Dc suddenly started acting very naughty

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My dc are 4,5 and 7. Up until recently they were very well behaved. They had the odd day where they would misbehave, but it wouldn't last long.

Since going back to school they have been such hard work. They constantly demand things then scream if they don't get them. They bicker and fight with each other. They don't listen to instructions. They throw things and break things. They are disrespectful towards me and their father.

I'm ending every day in tears.

I'm assuming it's down to them being tired from being at school as that is the only change. The older ones have only started acting like this though, so I don't know why as they never used to.

Can anyone offer me any advice?
Thank you.

Mine are 6 and 7 and cranky since returning to school (but not too bad)
Make sure you keep boundaries in place. No tv no tablet etc until the behaviour improves. Are they getting enough sleep? Hungry?

Obviously I don't mean no tv at all. But cut it down. I find too much screen time impacts behaviour

I'd try a slightly earlier bedtime, and let them know their behaviour was why! Sounds exhausting for you but my guess is that they're tired and slightly out of routine and I'd crush them back into early bed, bath etc.