DD (11, in year 6) is completely forgetful and totally absent minded.
She forgets to bring home homework, forgets to hand it in, forgot her bike for Bikeability this morning, forgot after school club, forgets her lunch, and the latest - she was supposed to stay in for 5 minutes at lunchtime today as she didn't hand in grammar homework on time, but forgot to go so has to stay in for 10 minutes instead tomorrow and I have absolutely no sympathy.
I spend half my life chasing her around, reminding her of stuff and generally chivvying her along
When she went back to school in September we made a big planner, filled it all in with clubs, homework times, piano practice, PE days, swimming days, etc, etc and stuck it up on her bedroom wall. It gets updated with homework as she gets it. I remind her to check her planner every morning and evening to check she has the right stuff/got her homework/whatever and stepped back and let her take responsibility for her stuff, and to accept whatever punishment her teacher gives her
A friend thinks I'm being harsh and the kids shouldn't lose their playtime - her DD also has to stay in for 10 minutes tomorrow and is going in to see the head
I think at 11 she's old enough to take responsibility for her actions and face up to the consequences without Mumbles interfering