Note-taking is not transcription of the lecture. It is an active process of sorting out what might be significant in the lecture as you hear it. You will profit if you can review your notes before the next lecture, as a kind of preparation for the next lecture. I recommend you evolve for yourself some version of the "Cornell note-taking system." See the article in wiki-pedia. Or click here for an overview of the system.
Here is another overview
To make your own "Cornell note-taking system" notebook inserts Click here.