Press space to start (the same). When you come to the locker, use the arrow keys to change your locker and when you're happy with your locker click the choose button. On the top of your screen there will be a programe which will pop up with the class that you need to go to. Once you're inside the classroom, answer all the questions then, the next class will come up on the programe.
I changed the music (not because I didn't like the one that it had before) and I also created a new 'changes sprite' which didn't really need to be there, I just thought I should 'remix' it a little bit more than just the music so I haven't just 'stole' the project and made it my own. I loved the original by @DonutKittyUnicorn!!!!!