Logistics

How do teachers keep all the papers straight from all their different classes?  This is something I'm learning from my CT.  One thing I've picked up that I really like is that she has laminated folders, one for each period we teach.  Inside the folder is grade sheets for particular assignments, such as mastery tests, and clean copies of what worksheets we are using that day.  When a student is absent, she writes their name on the worksheet and attaches it to the outside of that period's folder with a paper clip.  Due to our block period, it is hard to always remember who was absent the last time we saw this class.  When the student returns, we can easily see what worksheets they missed and give them to him or her.