1) www.quizlet.com (General revision site. Really good for interactive quizzes on the literature texts)
2) http://www.bbc.co.uk/education/subjects/zckw2hv (Literature revision and quizzes, plus sample exam questions)
3) http://www.bbc.co.uk/education/subjects/zr9d7ty (English Language revision and quizzes, plus sample exam questions)
In addition, there are revision guides for all of the set Literature texts on Parent Pay.