W: How’s your exam
M: I failed again.
W: Why Did you oversleep again
M: No, I didn’t.
W: Then, what’s wrong with you
M: I can’t tell you.
W: Come on. I’m your best friend. You can tell me and I can help you.
M: You know, this time I made full preparations, but John told me that he couldn’t pass the exam since he had to spend all his spare time looking after his mother in the hospital. So I let him copy my answer during the exam. And we were caught by the teacher. Both of us failed.

Why didn’t the man pass the exam()