The best thing for Business Studies is to just memorise the syllabus, period. I got 96 in Business Studies

It was my best subject. Seriously that's all the markers look for. They'll be like "name one form of covert employee resistance" and you'll be like "work-to-rule" (I don't know if they've changed the syllabus in the past 5 years) but ff you memorise the syllabus, it's pretty easy to extrapolate on.
Name-drop as many headings from the syllabus as you can. That's all there is to Business Studies. Syllabus, syllabus, syllabus. Or at least it was in 2009.