Does it surprise you that Anne says she might do some algebra? Why does she say this?

Anne dislikes Algebra and usually saves it for last or doesn't do it at all.

I loathe algebra, geometry and arithmetic.

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"Which books are ruined?" I asked Margot, who was going dirough them.

"Algebra," Margot said.

But as luck would have it, my algebra book wasn't entirely ruined. I wish it had fallen right in the vase. I've never loathed any book as much as that one.

Anne decides to do her algebra because her father told her she'd have no tutoring after the war unless she does it.

Even Pim isn't as nice as he used to be. He's been trying not to treat me like a child, but now he's much too cold. We'll just have to see what comes of it! He's warned me that if I don't do my algebra, I won't get any tutoring after the war. I could simply wait and see what happens, but I'd like to start again, provided I get a new book.