I took AP Latin: Vergil in high school. That was one of the hardest classes I&#x27;ve ever had to take because the grammar is so complex (I&#x27;m also not surprised Japanese has few perfect scores). I know I didn&#x27;t get a passing score.<p>I&#x27;m surprised however that Chinese has no perfect scores. I remember some students that had moved from Taiwan or China would take AP Chinese to get free college credits. The grammar of Chinese is so simple compared to Latin or Japanese. And from what I recall, AP Chinese tested Mandarin at a 2nd grade level, and didn&#x27;t test much or any of the <i>chengyu</i> (成語: Chinese proverbs) of which are difficult because of the shear number to remember.<p>Perhaps graders could tell they were native speakers, and thus raised the bar? (I took 3rd-year Chinese as a filler class &quot;language requirement&quot; in college and the professor expected high-school level of Chinese while she expected chicken scratch from others for the same grade.)<p>AP Computer Science seems likely to have a good number of perfect scores. I remember a test reviewer telling me that they often overlooked syntactical errors (unbalanced parentheses) and would allow API calls to incorrectly labeled API functions. (I don&#x27;t disagree, because CS is more about understanding data structures than it is knowing how to put code on paper without an IDE or reference.)