Personally, I just rote learn 4-6 paragraphs. Due to the narrowish scope of the modules, it's relatively easy to write an essay that can answer almost every single question. Obviously, it might not be perfect, but you can always sub things out for other content and make minimal tweaks. I would never pre-write introductions, however, and instead write them and my thesis on the day (but I'd already have a shell of a thesis, usually some sort of "textual truth", if that makes sense). For Mod B, where a text could be specified, I've written a paragraph for every single Yeats' poem, and an extra one for 3 of them, and I'll try memorise them all. I guess the caveat here, is that, to some extent, your prewritten response won't always line up. To get around this, all I can really recommend is having a really good response written, and having a good grasp on the texts, their form, and context.
For discovery, for instance, every discovery is likely to be influenced by/have an impact on personal values, and its interpretation will be grounded in the context of the individual, etc. A good essay will address these points and all the other areas of the rubric sufficiently regardless of whether it is explicitly the question.
Of course, its all personal, but its the method I prefer as I can go in with a really refined and well written essay, and am unlikely to jumble my thoughts.