How to Level, Sort, and Organize Your Classroom Library It's really pretty simple; just takes time. 2. As we found the levels, we stacked the books into piles… all the A's together, all the B's together, etc. Any book without a level — we put them in a separate stack. 3. We took all of the Level A books and sorted them: fiction and nonfiction. We did that for each level. 4.