One widely discussed study, for instance, judges students on their ability to parse the muddy and semantically tortuous opening of “Bleak House”; this is a little like assessing swimmers on their ability to cross fifty yards of molasses. WTF. Asking university English students to read a book is not asking swimmers to go through molasses.
If an adult English speaker cannot understand the opening of Bleak House - quotes given elsewhere in this thread - they are effectively unable to access the bulk of English literature.
This is not someone who belongs in a university English course, this is someone in need of remedial English lessons.