I thought his first sentence made his point. I didn't know what an N2 was either, but from the context I thought it could be some kind of test he barely passed.

I thought his first sentence made his point. I didn't know what an N2 was either, but from the context I thought it could be some kind of test he barely passed. Maybe whether one can make a reasonable guess depends on more than the context - perhaps background, experience, and point of view. I know I've missed points that are obvious to others because of our differing perspectives.