I am on this section as Ds1 is 13 but when he started secondary I tried to set him up to succeed.
Firstly, he has a daily list of things to do, with shower, breakfast, brush teeth, tidy room, make bed and open curtains being on there. That way he knows what is expected of him and I don't have to nag.
He has a pin board with Mon- Fri on it, every bit of homework he gets get written onto a pre cut piece of paper and pinned to the board on the day it is due in. That way he can see at a glance what needs doing first.
Also there was a ban on playing or tech until a particular time every day allowing time for a snack, to get changed and then do the homework.
The whole of year 7 I sat next to him and taught him how to make notes, changing sentences so that he wasn't just copying stuff. I checked his work, asked about specific lessons to find out what he was studying and if there was any way to extend that knowledge.
Now he is in year 9 and he is on his own, but doing incredibly well.
I feel that year 7 is a hell of a learning curve and they shouldn't just be left to get on with it if it is clear they aren't.
If all homework is done, then my children are allowed tech/computer games/YouTube etc. If homework wasn't done then they don't get to "play"