Each month we have a fire drill so we can practice leaving the building in case of an emergency. These are just practices. Your teachers will know exactly what to do when we have a fire drill. Just pay attention to them when they ask you to line up quietly to exit the building in line without talking, running, or pushing.
Once your class is outside the building, stay in line without talking, so your teacher can check to see that all your classmates are with you. When the all-clear signal is given, your teacher will direct you to enter the building in a quiet line.