Color Coding saves the day.

Morning are usually the busiest. There isn't a single second to spare. In such a scenario, one has to struggle through the stack of notebooks. Well, voilà! Color coding is your refuge.  Use crayons to highlight the notebooks according to the subject. It would save you the early morning combat with your notebooks. Moreover, it would give your otherwise empty notebooks an appealing look. Tip: You can also use colored sticky bookmarks/ colored tape. If you want to avoid the effort then you can simply buy different colored notebooks.