[She's a little taken aback by his quick answer, and it has her turning to face him just as they reach the doors of the library.]

That's a little presumptuous, isn't it? You don't even know anything about me so how could you know what I'm good at?

[She is forced to admit, at least to herself, that most of the classes being taught are about things she doesn't know anything about. But to assume she couldn't learn is a little hurtful. Does she really seem that hopeless?]

And it's not like I won't study.