A)A. He did better than expected.
B)B. He failed the math exam.
C)C. He used to be a top student
D)D. He answered only 10% of the questions
原文：
W: John, how did your maths exam go?
M: I thought I might have failed, but in fact I came in the top 10% in the class.
Q: What can we learn about the man from the conversation?