Color Coding and Cardboard
To help students stay organized, I assign a color to each subject. Everyone has a red folder for science, a blue folder for math, a yellow folder for reading, etc. This way it just takes a quick glance around the room to see who doesn’t have the correct folder.
To keep their desks organized, I have them put two boxes from a 24-pack of soda in their desks. They fit perfectly and they no longer lose things in the back of their desks. If they need to find something, they just pull out one of their "drawers."