For all of you who are taking part in the train battle, there is a few things on spells.

We are all first years, so there is a chance are spells will mess up. If it is a spell, that you learn in years 3-7 you will definitely mess up. If it's 1-2 you have a chance to mess up. So keep in mind year 1-2 spells, and don't make every single one of them succeed.