It can be very frustrating when the expectations of teachers and the actual marking present in exams do not align. In your case, I would've recommended just doing whatever style your teacher mentioned for the SACs considering they will be the one marking it. However, you've obviously finished all your SACs so that's pretty pointless.
Honestly, I think you may be better off doing the holistic approach to language analysis rather than a simple chronological approach if the only thing you have left is the exam. The main disadvantage for this is that you teacher won't give you constructive criticism if they don't agree with the approach. I suppose you could still ask for feedback on this forum, but that is less desirable/efficient.
I'd choose an approach now based on the strengths/advantages the way you see it (for example, you may be more practised in one approach) and keep refining that in the lead-up to the exam. If you decide you want to a 'stakeholders' approach I'm sure there are tons of resources/answers in this sub-forum already, but if you're still unsure, I'd be happy to help you with what I know about this method.