How can I decide what to memorise from my set texts so that I'll be able to answer anything which might appear in the exam?

There are several ways to select quotations to memorise for your exams. As memory space is limited, you need to make sure you select efficiently, memorising only those passages which will be useful in a variety of circumstances.Your quotations will be used to support the points you make -- so they need to either demonstrate the significance of a theme, tell the examiner something about a character, or exemplify a structural or formal aspect of the work you're discussing. In each of these categories, it's best to have a few different example quotations so that you can pick one or more depending on the particular question you answer. When looking for passages fitting these categories, it's often possible to find lines which might work in several situations -- for example something which embodies an important theme, and also expresses it in a structurally interesting way. If you can find several of these, you'll have more options to choose from and more freedom in how to use what you've memorised.Once you've identified key passages and possible lines to quote from, make sure you memorise as short an excerpt as possible in order to evidence the point you want to make. This will make it easier to remember under pressure in an exam. Ideally, make it something original so your ideas will stand out to the examiner, and form some short bits of ready-made analysis about the line or lines which will be useful regardless of the question you're answering. When you have your quotations finalised, memorise them in a way which works for you, for example by grouping them by character, by scene, or visually in different colours in your notes.