Use highlighters and different colored pens to mark up your notes and write in the blank spaces. If it helps you . Some people religiously recopy their notes. While doing so, they simplify and organize the information, check if they missed anything, etc. Other people map their notes, a specific recopying technique.
Some people find recopying notes a complete waste of time .
Note the date every class and keep the dates in order. Biology and Philosophy notes don't mix. Just as your room quickly gets to be a mess if you just ignore it, so will your notes. Note taking caters to different learning styles in different ways. Find out what your style is and use it to your advantage while taking notes.