Rote learning is only efficient for English students who have created generic essays that are guaranteed A range and cover a wide range of syllabus content so that the possibility of a bad question is extremely limited.
The hours put into rote learning only equalled about 2 or 3 for each essay for me, but I must admit that the Hamlet question threw me off a little in the exam since my essay was a little bit more difficult to adapt. This didn't really turn out to be a problem for me because Hamlet was my favourite unit and I studied it so in-depth that I had written 5 essays on the text and knew the text virtually inside out (I ended up getting 19/20 in the external for that essay). But this was pure luck that the text I knew in depth was the difficult question. It is easy to say "adapt" but for students who don't understand the text and the syllabus "adapting" is near impossible. My friend who had gotten 20/20 for both our internal Hamlet assessments (trials and term assessment) based off his 1 rote learnt essay received 12/20 in the externals because he didn't know enough to adapt in the end. That is why rote learning is inefficient; because there's too much risk involved.
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If one is going to prepare a generic essay based on ideas derived from a few other essays, and have a rudimentary understanding of the text, they are inflating the risk of getting into the exam and seeing an unsuitable question.
I think the issue with generic essays is, kids focus on overarching ideas rather than niche statements. Therefore, they have a propensity to express an overarching concept in response to a very specific question, which automatically gives away the fact that their essay is memorized, and it inevitably deducts from their marks. Moulding is not merely a skill where you alter the topic sentence and you're good to go, it is more moulding the entire essay to fit the question, with a sustained thesis and techniques relevant to the question. This is where the distinction is made between a generic essay focused on one central concept, or an essay that has a good choice of techniques and is readily adaptable to many concepts and thematic elements.
Given this, I cannot in good conscience pose that one can create an excellent generic essay, systematically regurgitate this essay and get close to full marks or even full marks. Ever so rarely is a question going to state "explore how meaning is created". As English is being criticized as a subject which fails to measure analytical skill, it has become progressively devious from generic questions, and more centered towards specific concepts, such as time and belonging. Because of this, it is only fair to say that a prepared generic essay is most effective with students who know the texts in depth and can substitute techniques to support an essay that is directly responding to the question, not alluding to the asked concept through generic ideas.