In contexts such as OP's, X-wise means when considered specifically in the context of X. It's a construction commonly used to create "nonce" terms (one-off coinages whose precise meaning is specific to the context, but normally obvious to the reader/audience in that context).
Here are a couple of instances from Google Books for dinner-wise (just a noun I chose at random). Note that they're separated by over 150 years, showing that the construction has been around a long time with no significant change in how it can be used...
Gentlemen, I incline not dinner-wise. And why? — I have dined already
(Brother Jonathan, 1842)
I don't know what the wife can do dinner-wise but there'll be something
(Death at Hallows End, 2008)
Perhaps unwisely, OP's cited context blurs the distinction between intelligence and knowledge. Almost certainly the quiz-setter is asking whether you think you're good at book learning. That's to say, are you good at absorbing information from books (rather than personal experience), and/or good at passing exams and succeeding in an academic context (as opposed to having practical skills, common sense, etc., being types of "intelligence" often claimed by "non-academics").
In OP's specific case, book-wise primarily restricts the context of "intelligence" to the ability to absorb information from (academic) textbooks. But it's easy to imagine a context where the restriction is significantly different...
I get through several tabloid newspapers and magazines every day. But book-wise I'm not much of a reader, so I hardly ever visit the local library.
...where in that context the speaker may well be referring to books as a source of entertainment (novels and other works of fiction), rather than "information" as such.
EDIT: I've just realised that some learners may find OP's specific example confusing because they might understand intelligent as meaning wise (having wisdom). But etymologically that word is unrelated to the suffix usage. From Your Dictionary...
The suffix -wise has a long history of use to mean “in the manner or direction of,” as in clockwise, otherwise, and slantwise. Since the 1930s, however, the suffix has been widely used in the vaguer sense of “with respect to,” as in
This has not been a good year saleswise.
Taxwise, it is an unattractive arrangement.
Best Answer
A reference book is a book that one may never check out; they are usually expensive, so the library doesn't want to risk a user losing or damaging it. But the key is that it is a reference book that stays in the library so that many students can use it, such a thing as the Oxford English Dictionary.
A reserve book, on the other hand, is a book that is temporarily unavailable to check out (or that may be checked out for a shorter than normal time period), because a professor has placed it on reserve. This is usually because it is a book being used in the professor's class, and he or she has placed it on reserve so that her or his students may have access to it in the library. Or, as the definition from the Harvard Library says, students may sometimes check out reserve books, but for a shorter time period than usual. This can be as short as one or two hours. Again, this is because the pofessor wants all the students in the class to have access to it. Thus, the book may remain on reserve status for a semester or longer. Also, professors may place books on reserve for other reasons. Then there is the sometimes galling thing that a regular book may not be available for many semesters because a professor has checked it out indefinitely.