the worst condition with the worst situation

Today may be the worst day in my school life because I've taken a wrong examination paper during the exam. Although most of the questions were easier than the one I should answer, a part of questions which containing 15% of the whole exam, were based on the reading materials in the textbooks. And that's was completely different to the part I revised before. Because of knowing nothing about those related passages, I could not able to know what the correct answers were. This makes me worried about the exam result. I'm really afraid to get a failure result. What's a bad day!