Ds1 is in year 7 and I helped him get organised but he does everything himself.
He has a noticeboard/pin board in his bedroom next to his desk with days of the week on, every time he gets homework he writes the homework ie "maths, finish mymaths online" on a slip of paper I pre-cut and pins it against the day it is due in. That way he can see at a glance what he has to do. If it is a long project he writes the date on. He has a school planner and all their homework is written into that so I can cross reference if needed.
He has a wooden magazine files with days of the week on, he unpacks his bag, the books go into the day when he next needs that book. His timetable is pinned onto his noticeboard.
2 pencil cases, one for day to day stuff one for pencil crayons, maths equipment etc and they stay in his bag, he has duplicates on his desk. In his pencil case a laminated timetable.
As I love laminating, he has a what to do today list (it is also spiral bound, gotta love a spiral binding machine) so it has a morning list, including tidy room, open curtains, phone into bag, watch on your wrist. And an evening list so music book into bag, games kit out for tomorrow etc. He packs his bag the night before.
This works for us, I have put into place the tools he needs, he uses them and refers to the list every single day.