In a 12 Mark Question you must have:
AO1 - Briefly introduce Knowledge, and explain terms - What do you already know about the research method?
AO2 - Application - link to the scenario in Q - Specific IV + DV, situational/personal factors; (un)controlled? + type of sampling.
A03 - Analysis & Evaluation - Strengths & Weaknesses with GRAVE + link to a study you learnt.
Conclusion - What method is good & not good for (based from what points u have established).
Note: don't worry if you already start evaluating in AO2, in fact you can merge them together, as long as if it's mentioned in detail.