You've never had one of my physics open book tests. God, it's like the teachers turn into font/formatting inspectors or something. We're usually only allowed to bring one page of information in and they collect it at the end to make sure that you haven't taken advantage of everything. May you rest in peace in the afterlife if the teachers found that you "cheated" by not adhering to the rules.
Ah, you guys seemed so organised. But, it's a bit early, don't you think? Relax. You have two weeks of holidays left. School stuff should always be worried about the weekend before school stars (at least, that was what it was like for me).