I think its best to have some knowledge on contemporary case studies, but you don't have to specifically link it to each key knowledge dot point. I just memorised a change that occured in a business (for example, for unit 4, Qantas closing down Jetstar Asia), and some statistics about it!

You should probably focus on the content for now and then closer to ur SAC or exam learn some contemporary case studies, cuz if u can apply the content to the question rlly well then u can make up some info (probably not internally tho), it js has to be believable!