I have helped with oractical things - there is a ready supply of new print sticks, pens, pencils, rubbers, rulers and protractors for when the current ones are broken. There is always ink in the printer and paper for it, plus plenty of lined paper and also coloured paper for posters etc. These practical things just allow them to get on.
I copy and laminate timetables at the start of the year and pin on the wall and give a version with blu tac for the inside door of school locker.
I have also established an after school routine of a nice snack and drink,followed by homework, dinner and then TV - it is just taken as the norm now.
We haven't needed to buy extra books, but I will as they go up through the school.
I try not to check every little thing but I do look at their ex books now and then to see what they are doing and the kind of comments they are getting on their work.
We also help by trying to facilitate staying for after school clubs (picking up) and school trips.
We've always gone to the library monthly and we still do that - not for school specific stuff but that love of reading helps all subjects.
If asked for help with homework or finding some info online, we try to help.