What was it? What was the context? I'd say mine was the Lie Theory and Particle Physics paper I sat today. Universal consensus was that most people felt they'd be lucky to get over 50%. I reckon I did maybe mid 60's, which doesnt seem to be that bad relative to what other people are saying, but I went into the exam hoping for high 80's. What were the factors that made it hard? I would say our lecturer set challenging problems with minimal "bookwork" but also that I was very tired on the day due to a dreadful nights sleep the night before. Coupled with a paper that involved some very long calculations (21 dimensional weight diagram for reps so(5) ) and I was pushed for time. I've done worse in exams before but that was because I was unprepared.