A. According to reports, the toughest AP exam was AP Physics C last conducted in the year 2023 and the following was the passing rate: AP Class/Exam Pass Rate (3+) Perfect Score (5) Physics 1 43.3% 7.9% United States History 48.2% 10.8% United States Government and Politics 48.6% 12% Macroeconomics 51.8% 16.4% Human Geography 53.2% 14.9% Environmental Science 53.8% 8.9% Apart from Physics, US history, US government & politics and other AP exam classes were also classified under the toughest exams, with lowest passing rates.