I think it really depends on the individual. Like some people may feel the need for tutoring for Business while others don't. However, if you were to go Business tutoring it would probably be most likely for developing and refining your exam technique, learning tips and tricks from people who have already finished the subject, etc. So if you can find an arrangement where you go to tutoring either once a month (for let's say 1-2 hours depending on how much you need) to refine your writing while being able to be in contact with them for short answer/essay marking then that would be ideal (though probably for this service you may need to pay extra). Basically what this will do is ensure that you maximise the potential mark you can get in the HSC, but it'd be up to you to learn the concepts.
If you go for 1 hour each month I'd expect them to charge maybe $60-$100 per month (not too sure on this though) mainly because you will be continually getting your responses reviewed throughout this month which will accumulate to quite a bit of time.
And you can follow what Drifting said if you have faith that your teacher is a good marker, though if you're not certain you could contemplate what I said prior.
tl;dr version:
Business Tutoring -> Refining exam technique and essay writing skills, find a tutor that has the ability to continuously mark your Short Answer/Report/Essay responses and once a month meet up with then for 1-2 hours to discuss how you can further improve your skills, and to clear up concepts if you are stuck.