I spent years as a homeschool mom trying to keep track of assignments that had been written on loose leaf notebook paper. I used to have 3 ring binders for each child with tabs for each subject. After a child completed an assignment it was to go in the notebook behind the correct tab, hypothetically, of course. The truth is, sometimes it would make it in the notebook in its proper place, but mostly there were papers of all kinds stuffed in the pocket in the back cover of the binder to be sorted through "later." (There is a lot to be done "later" for a mom of many.) Multiple kids times multiple subjects equals lots of papers to sort through.
I finally got wise to spiral notebooks. I buy them in bulk on sale at the beginning of the school year. Each child gets a different spiral for each subject. I write the name of the child, the subject, and the school year on the front, and voila, no more papers to sort through. All written work is done in the appropriate spiral; spelling in the spelling spiral, logic in the logic spiral, dictation in the dictation spiral, etc.
That's what works for me. For more handy dandy tips, go to Rocks in my Dryer.