Arthur's exams

Arthur writes his 4th exam tomorrow - English Literature. The English paper (his first) caused a bit of frustration. Not only did he discover that his teacher had, for some unknown reason, entered him on the higher grade, but he also could not finish the last 2 questions that totalled 12 marks out of 50. Then.... before starting the 2nd English paper, the person invigilating admitted that she had made a mistake with the time allocation of the first paper, and had made them stop 45 minutes too soon!