Found that out too lateWalked in with notes without studying at all, hehehehe.
You hear open book exam and you go 'so I can bring my text books & notes into the exam, piece of cake!'. Meanwhile back at the ranch these papers are harder than the other ones and you don't have time to sit there and page through a book, it's only for a quick reference so you really need to know your schite.
I think we all make this mistake only once...