Does telling students to take notes in high school really help them learn better? I don't feel like it actually helped me. I now sense long after high school that taking notes and reading them probably did not help. Now I understand why it could work. In theory, somebody who thinks for themself could use their own method of trying to understand the parts of a lecture they are interested in understanding, using a complex method writing down the results of what they figured out about their method of thinking and slowly improving their own method of thinking and writing. However, when I was in high school, I didn't understand why I was told to takes notes so I used linear thinking and just copied down what ever the teacher was writing on the board and then read my notes and I'm not sure it really helped.
The lecture is a very inefficient method of training.  Passive, linear, etc.  Working problems, reading texts, doing examinations is much more active and time-efficient.

If you really want to get max value out of a lecture, read the text ahead and work the exercises ahead.  The lecture then is refresher and an alternate viewpoint.  Your notes will only be of something unexpected (as the text is available and familiar for expected things).  

P.s.  Of course, this as on oft written on topic and a Google search and review of the results would be a more active way to analyze it.  Rather than asking here or some other answer site.  Sort of analogous to the student in lecture, no?