GCSE AQA LiteratureWatch this thread
Romeo and Juliet, The History Boys, Jane Eyre and Power and Conflict cluster
Obviously, know the plot as thoroughly as you can, because even if you forget actual quotes from the story, you can back up your ideas in your essays with brief examples. Watch the movies too if you fancy; they'll help you remember quotes too.
Themes are likely to come up, and in some questions you might have to connect a certain character to a certain theme (i.e. how does Shakespeare use the character of Tybalt to explore ideas about hatred and violence in Romeo and Juliet?') rather than just asking you to regurgitate all you know about a certain character.
Know a bit of historical context too - examiners like that.
Get yourself a text guide for the books you're studying too; York Notes is the standard one but the CGP ones are really good too, I used them a lot in my GCSE revision.
I hope that helps!