I just made my normal class notes, summarised the textbook, and then used the syllabus for revision. There are a few things in the syllabus that's generally not in the textbook, so either you make notes on them, or just learn them and remember them. Your teacher will probably go through them with you.
Just make notes on stuff you think you might forget. If its a concept that you now understand, I wouldn't put that in your notes, cause normally it ends up with you writing out the textbook. But if its say a list, such as the different things an organisation does, then do that.
Basically, just make notes on the stuff that requires memory work. For the concepts, don't bother. if you forget the concept, then just read back through the textbook or notes, and if you've definitely forgotten, then ask a friend.
and uh, don't do what my friend did. His got 400pages of summary notes on ecos...he'll never use it! Mine are about 10pgs each topic, max.