How to study and how to remember what you studied

First copy your notes in class by writing them, then later rewrite the notes using shorthand as need be.
By rewriting your notes, your brain has to focus more and concentrate on what your writing, embedding the material deeper inter your thinking.
And yes it is a very time consuming process, but if mastered you'll be able to remember your notes after writing them the first time! This is what got me through my AP classes in high school!
I hope this helps out!