It is at times like these that I'm thankful of my school system for paying for our AP exams. This year I took the US History, Calculus AB, and English Literature and Composition exams.
The History and English ones were alright in terms of difficulty, though while I understood the writing portions for both fairly well I think I did quite bad in my responses. I just can't write well under such a short amount of time and pressure.
The Calculus AB exam left me traumatized. Like one third of the multiple choice I knew how to do, another one third I sort of knew what I was doing, and the last one third I had no clue. But that's not the bad part.
The bad part came with the free response questions. Six questions in total, each with four parts. Half I left blank and the rest was random guessing. It was really frustrating knowing what the question was asking but just not knowing how to do it with the information given. That and the fact that some parts required you to use the answer from the previous part to solve it.