She was using indirect references to ease the pressure applied to you. Instead of saying "hurry up" she said "pull up your socks," and "the other students are wondering why you are not finished yet." This is in order to take the emphasis off of HER and put it elsewhere. That way, you don't get mad at HER for nagging you. I know because I was trained to be a teacher. (OK, everyone together: BOOOOOOOOOOOOOOOOO!!!!!!! ) By directing your irritation at undefinable objects like your socks and a group of "other students" who actually didn't exist at that moment, you had no one to blame.