The Problem: Imagine if you had spent a whole year (or if you were lucky, a month or two) writing lots and lots of notes and these notes were the key to your understanding of certain topics and were the foundation of your revision. What if you were to lose them? What if you were to somehow damage them? There is a chance that you may read them back later and realize that they do not make a lot of sense / you are no longer clear on what the meaning is. Then what?
The Contemplation: I would suggest you do what I did; have your notes based upon universal science glossary that is easy to understand. This way you could then write less notes (saving time) and use the glossary to start from the basic meanings and scientific terminology and progress though to the harder to understand. At the very least it would be good to use in conjunction with your existing notes to cover all the gray areas you have. I would go one step further and bring these ideas into the modern age and have them focused upon one knowledgeable, easy to understand, constant, informative and extremely helpful source.
I also found that when I was studying science there was a lot to take in and there are many multiple meanings within terms and words that mean exactly the same thing. These meanings, terms and words just come from different places and times. Who knows why they could not have just used one way or one description or kept the same words and terms instead of changing them? Learning all the new terms is hard enough, right?