I’m not a good lecturer

There is a student whose name, I probably won’t be hearing again. During the exam, he mailed our study program, reported that the exam they got haven’t been lectured before. When I correcting students exam, I found that this student answered the exam perfectly, as how I put it on slide. His name does not even appear when I googled him, but since then his name always appeared in my mind. I’m not a good lecturer.