AP Computer Science A Test

why do so many people get 1s on their AP Computer Science A test? I mean, 20.9% percent of people got 5s on 2014, while 31.5% percent of people got 1s. The 5 percentage is really high, but so it the 1!!

@Pedro73 Different AP tests have different scoring curves. Also the population of test-takers for each exam makes a difference - for example, the proportion of test-takers scoring 5’s on Calculus BC or most of the foreign language exams are higher.