Odette, clearly

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You can buy cards from Jac instead... I used those in conjunction with sheets of things I felt needed to be covered, but weren't on the cards. Saves a lot of time

. Also try to summarise the text as you go, although it's often a good idea to complete each section in class so you end up with a better summary. Even if you know something isn't going to be covered on a SAC, learn about it as though it is the main focus. It only helps you later, and if it is able to be convincingly incorporated into the SAC, it only benefits you to do so.
Past the textbook and sources of current examples, you only really need one or two study guides throughout the year. You can always buy more if you happen to have spare time around the exams, but do try to use what you've got throughout the year. Again, A+ is a good one to have, and I liked Revise In A Month too, but that's just me. Leading Edge was quite thorough, perhaps not enough questions. I don't know, they've all got their pros and cons, but your textbook should cover most things; the course is not exceptionally complex.
When reading through any case studies, try to identify as many concepts as possible, even if they are only very lightly touched on. Consider the implications of any business action you hear of on the news (to all associated parties and whether advantageous and otherwise), and any suggestions/improvements you could make regarding these. Doing this will really help you in applying your knowledge in an efficient and detailed fashion when it comes to case studies in SACs and the exam. Inside Business on ABC Sunday mornings (after Insiders) was an easy way to practise that. Also reading the Business section from The Age, documentation from Annual Reports/attending AGMs if you're a shareholder, listening into/participating in parent's friends' discussions if they talk to interesting people, and simply having a job (particularly in terms of general HR, policies, Workchoices) all often prove useful in forming a better understanding of the business world.