How should I structure an A-Level answer to ensure I reach my desired mark bands?

Both OCR and AQA structure their mark schemes around five Assessment Objectives (AOs). Some portions of your examination will require showing knowledge of all five, others only a selection. In short, they are: responsiveness to the question; textual analysis; historical context; comparison to other texts; awareness of critical opinion.

The most important thing to note is that analysing the text, whether that's a text in front of you in the exam hall or a prepared text (with quotes and thoughts committed to memory) meets only one of the assessment criteria; if the analysis is precisely relevant to the terms of the question you're still meeting less than half of the relevant AOs. It is absolutely vital to pepper your answers with contextual information: historical information that informs how you read the text; other texts and generic conventions that are relevant and what significant critics have thought about the text. You do not need a great density of information to meet these three criteria: a general early modern assumptions about female sexuality, for instance, would be quite adequate to support part of your answer, and you need not interrogate the opinions of other critics in any great detail. The structure of the mark scheme is such that breadth is vastly more important than depth: regardless of the quality of your answer, if you omit to attend to a given criterion your answer will be very harshly penalised.