selected material on the author and his times
wikipedia on george orwell
online-literature on george orwell


novel guides to animal farm (interpretation, characters, summaries,...)
novelguide on animal farm
sparknotes on animal farm
gradesaver on animal farm


have a look and gain some in-depth knowledge on Animal farm
Even if you haven't read it you get good and detailed summaries, character descriptions, discussion of themes,....
--> might be useful for your exam!!!!!