Unfortunately, not all novels will have pre-formed quiz questions and answers. If you look at something like eNotes "Hamlet" Navigation bar (found on the right) you will see that along with the Essays and Criticism choices there is a "Quizzes" section.
Ellen Foster does have a Navigation bar, also on the right hand side of the intro page, that includes useful categories like summary, themes, historical background and character analysis. So far, no quizzes.
If this is something you would like to have available, let me know. Please also send along any other works you would like to see have quizzes made available.