i try and do 3 case studies per paragraph and make sure their all succinct with each other so that when i reference different things in the paragraph i can integrate them back and forth without dropping it one sentnece and not referring back to it, from feedback ive gotten, my teacher has said this makes for a more concise response, which means u can hit the a range marks, my advice would be just to spend like a good 5 minutes for planning out your response and where u can stick the case studies examples in, you could even steal them from the short answer or multiple choice, just refer to an actual business that may use that example.
statisics don't even have to be exact just make them sound realistic, like apple making $600 billion in net profit sounds ridiculous, and the hsc markers will see right through it, it'd help to use smaller businesses as examples bc the hsc markers know their shit when it comes to apple, qantas, and mcdonalds, so its harder for them to see through the fake example and then this also makes ur response not look exactly like the last 10 responses they've just marked lmao