Overall, I organize my school materials/papers by subject. I have a file cabinet with folders and also a closet organized by shelf. It also seems helpful to have a few folders be month-to-month (ie a folder for things I would only do in Sept or Oct since it is the beginning of the year). I teach fourth grade and have found this works great year to year.

I use binders. I have one for school business with tabs dividing things like newsletters, staff meetings, professional development etc. I have one for committees, guided reading, parent letters etc. Then I have one I use as a plan book. I made my own plan book sheets where I could be more detailed than in a comercial one. To this notebook get added calendars & as each day has it's own sheet, I can paperclip notices like for field trips or picture day to the day they go with. I use large manila envelopes to keep track of returned student items such as picture day money, book orders and trip slips. These are then filed in a basket near my desk for easy retrieval. I keep a bookshelf behind my desk just for teacher reference and that puts the binders within quick reach. My blacklines also are organized in binders by topic. If you use sheet protectors they are kept neat and preserved for copies. For student work I have a to be corrected basket that gets emptied each night. Finished or still in process work is usually filed in each students' own basket in a folder color coordinated by subject. For assessments/big projects I have a work in progress basket that sits on the edge of my desk. Each project gets it's own folder. When assessments are completed they are filed in an accordian file under the child. Then during conferences, I can pull out a sampling of the students work with no issue. Good luck!