What do the books Mr. Shears brings to Christopher reveal?

The books reveal that either Mr. Shears doesn't pay much attention, or he merely grabbed the first books he found.

And then I was tired from screaming and Mother took me back to the flat in another taxi and the next morning was Saturday and she told Mr. Shears to go out and get me some books about science and maths from the library, and they were called 100 Number Puzzles and The Origins of the Universe and Nuclear Power, but they were for children and they were not very good so I didn’t read them, and Mr. Shears said, “Well, it’s nice to know my contribution is appreciated.”