When I was in 7th grade I had a homeroom class where the teacher would hand out a photocopied form on it on colored (e.g. pink or orange) paper. It was divided into 8 rectangles (the same as if you had folded it half 3 times.) Each of these 8 sections referred to a class period, so we could write down our assignments (e.g. read pages 20-25, answer questions 2,4,7) for the day. I would keep this paper in my back pocket. 2nd graders, I don't think have class periods, and the homework is probably handouts. In that case I'd think having a folder with homework to-do would be good, and maybe the other side of the folder (or another folder) could be finished homework to turn in. This might apply to higher grades: you could try to see if the teacher will send a to-do list of assignments each day. For example, books to be read for book reports, things to bring to class for projects etc.