Startup Idea : Single class note for all students

As a student, we need note for the test or learning, but we always make note individually and share it by website, gmail or Facebook. In this way, students would have content duplicate with each others and not easy for other student who did not note to find it. Beside, they may have their own definition and own key word may mislead reader. Different from Evernote which is individual-centred, I'd like to build note platform which is only focus on this problem .