The thing about SAC is that there isn't a definite way to structure your essay. I've seen a mixture of Band 5/6 responses (from the NESA SAC workbook) that have different structures. Some would have an intro, 2/3 paragraphs and then a short conclusion. Others would just have their entire essay in full, without any paragraph breaks at all. The structure of your paragraph, however depends on how the question is worded.
The following paragraph structures were introduced by my teacher:
Question: Outline; explain; compare; contrast; distinguish; defineS: Statement (define)
E: Explanation (to demonstrate your understanding)
E: Example (clarify)
Question: Evaluate; assess; account; to what extent; how well does; justifyS: Statement
E: Explanation
E: Example
J: Judgement
Question: Analyse; discuss; explainS: Statement
E: Explain
E: Example
L: Link back to question
Question: Analyse; critically analyseS: Statement
EA: Explain with analysis
E: Example
L: Link back to question
I know there's so much to memorise but pretty much the definite structure for SAC paragraphs is having a Statement, Explanation, Example and Linking sentence. Very similar to TEEAL/STEAL but without the in depth analysis. It is important to include the course's fundamental and additional concepts, as well as the concepts from your elective options. The markers are testing you on how you can relate your topic back to the concepts. That's what SAC is basically is in a nutshell. If possible, try and include a social theory. For example, the conflict theory is perfect for Social Continuity and Change for China.
When in doubt, check out these sample responses
https://arc2.nesa.nsw.edu.au/view/default/course/15350Hope this helps!