Is prelims really nothing? I know marks don't count though I think about it this way. You don't expect a person to do gymnastics unless they've done the prior work before, even though that practice didn't count for anything.
Although as everybody has said Preliminary does not count for much, it's probably good to develop good habits during this time rather than just stack it on once the HSC comes. I'm not saying that you should of studied 4 hours a day though it would of been nice to dedicate at least an hour to...
I wouldn't recommend tutoring for Social Science subjects, since it simply is not needed unless you need to refine your essay writing skills, and even that can be done on this site with the help of some members.
Preliminary Business Studies textbooks
HSC Business Studies textbooks
Name of your textbook: HSC Business Studies - Getting Better Results 3rd Edition
Advantages of it: The textbook is clear, concise, and explains most concepts well. Easy to comprehend. Gives various case studies and...