Firstly, this should be in the English forum ... whichever level of English you're doing.
Tip: Don't try remembering whole essays, it's a worthless pursuit for most (EDIT: Except for Tanjin, but she's just too cool for school, that one, as she has indicated in the reply above this one), because if you memorise entire compositions, you end up with them stuck in your head, and consequently you might not be able to answer any question thrown at you.
With that said, remember a generalised thesis on the sort of journey you're studying. Such as "inner journeys are about adadadadada, and involve blah blah blah etc.", so that you can integrate it into an introduction and relate it back to the question, and so forth.
Memorise key points that relate to the kind of journey, rather than paragraphs on a specific topic sentence. Then, with each key point, add a quote, explanation of how the quote ties in with the key point, and how it relates back to the question. It's far, far, far (far far far far) easier to remember simple dot points than entire chunks of information, believe me.
With your essays, memorise the structure; so and so amount of words for intro, so and so amount for the prescribed text, stimulus, and related(s). Then have a firm knowledge of all the general points on your texts and how they're related to the journey(s), so that way you won't get thrown off, and you'll be able to adapt your argument(s)/topic sentences/points/whatever to the question.