My last year's notes were nothing and my this year's notes are actually in the red. I am in negative notes.
Books written by professionals are always going to be more accurate and more detailed than your own notes. Use them, and use the internet before things you've written yourself.
What's more, if you're always taking notes in lessons, I find at least that I just copy things down without thinking about them, so I actually lose understanding that would help me in the exam.
Love how everyone is having some sort of 'I've got more notes' pissing contest. I've yet to see any correlation between quantity of notes and grades.