In the real exam, isn't the marker someone who does not know you? That's what happens over here to prevent favouritism. If the teacher who is causing you to feel like this does not mark your paper, then you have nothing to worry about. The whole point of draft exams is to make errors, so you know what topics you need to improve for the real exam. And if you are sick and fainted, have you tried talking to a doctor? That's the person you need to go to.