That's not smart, he got lucky.
It has happened to me and at the same exam you mentioned. I read, I burnt my midnight candle but was ashamed of my score while the person I thought score higher than I did.
One thing I noticed with myself then was that I was overconfidential and the exam humbled me😅. I think its the same thing that happened to the guy who studied more. He was pressured, while the relaxed guy was cool and calm, he let faith fight it for him, exams are like spirits. Trust me when I tell you this 😅