It depends on the theme of the exam. I did Victorian Literature for AS, in which case I'd say look at the things about the appearence of the Upper Class, ideas of science vs religion and the treatment of women with Sibyl Vane etc. For A2 it was Love THrough the Ages, in which case look at the Sibyl-Dorian and Basil-Dorian realtionships or the Vane family etc.