Like plenty of past students have already mentioned, success in business studies lies in memorising the WHOLE syllabus. If you want to get the best possible mark you should memorise every part of it because in the HSC exam, they're going to SPECIFICALLY mention a dot point and everything under that is basically your guide to writing your essay/report.
For example, last years (2007) HSC exam asked about ethical aspects of business, which according to my memory/studies had not been (if not, asked much) asked previously.