I have known about FSMs before starting studying. What I had to relearn though was how to draw them, like basically reading and drawing stuff is what always was/is the big problem to me. I prefer to write stuff down and I am sure in a few years and actually in a few months I'll have forgotten about all of this.
It's actually the reason for really disliking papers that prove something. You forget stuff after you got that paper, but keep your degree.
Also one simply has to say that there are HUGE differences between what you need to get that sheet of paper, even if you went to the same school and often if you attended it at the same time.