I must admit my first thought when I heard quotes on the news from the students who hadn't noticed was that they obviously hadn't followed the advice of all teachers - 'read the entire paper thoroughly before you start'
Apparently it was a photocopying error which meant the list of tracks on the CD was on the back of the paper, so it wasn't literally the answers but useful information which was more or less the answers, like names of composers etc.
only OCR though so it didn't happen at our school.
It happens - in an A level exam the year before me, they copied an extract from a journal into the paper for students to answer questions on. The first one was a calculation. Unfortunately they had somehow missed out the sentence with all the data needed for the calculation. I've also seen examples of A level maths papers with 'proof' questions where the answer in the paper is wrong.
My finals at Uni one of the modules was an open book exam, and the lecturer had taken the questions out of the standard text book - which had the answers in the back.
Ha! Luckily my best friend DID notice and took great pleasure in telling everyone who didn't. Don't know what they're going to do now, surely it's not fair to leave it? Maybe they'll have to take away the marks for the relevant questions, both of the student and the overall mark scheme?
The mind boggles...
They are even meant to have reserve papers in case of some kind of cock up like this.
I read somewhere that the questions concerned only account for 5% of the marks so it would be easy enough to just discount those questions entirely and adjust the mark scheme.