1. Type up a study guide to help structure your notes. 

2. Type up or scan handwritten notes.

This will make them easier to organize and harder to lose! Rewrite your notes to make them more clear and easier to understand. If possible, rewrite within a day or two of class to reinforce your memory of the lecture

3. Consolidate your notes into tables or graphs once a week.

4.  Color-code: using different colored pens helps keywords and concepts stand out.

5. Type notes in class.

If your professor is fine with you having a computer in class, consider typing your notes. Programs like Microsoft OneNote allow you to efficiently take notes, as well as neatly add comments and edit.