For my AS Use of Maths Algebra exam every paper usually has 4 questions, so 4 pages. After we did the exam and the class was talking about what questions came up, they mentioned question 4 which surprised me because I didn't remember a question 4.
I had literally forgotten to an entire page of the exam, and to make it worse I had already skipped one other page because I got stuck on one of those multipart questions where you need to answer the first to do the rest.
I got an E for that unit, but I just did the retake today and it went quite well (I hope).