The Catcher in the Rye is another book that I would have expected on the list. I have been recalling other authors that I read in high school that aren't on this list: Faulkner, Arthur Miller, Orwell, Melville, Chaucer, Thoreau. I remember one of my favorite assigned books was The Count of Monte Cristo.
The earlier posts made me curious what books are studied in other countries like England. I did a google search on recommended books for English A-level, and the results were more typical of what I'd expect and rather similar to American curriculum (more so than this quiz list).