What do you think of me directing someone to the wrong exam room?
I don't know why you'd do that. Could you explain it to me?
I didn't like them and I thought it would be funny.
Even though you don't like the person, it would be bad to direct them to the wrong exam room. They might need the exam to pass a class which they need to graduate.
But he is so dumb and annoying.
He might be many things but he is also a student who probably paid for his education and that is a lot of money to lose by not taking an exam. If people are able to prove that you did that to him, then you might be in serious trouble with the school.