El examen de matemáticas

El examen de matemáticas es del autor Miguel Matesanz Gil y trata de

My name is Natalia Barrachina de Sastre. I'm in the fourth grade and today i've got an exam. In maths! Just my luck! I would have liked to revise a bit more, because i've always been a good student, but these last two weeks have been really crazy. My world has been turned upside  down, ever since the marching band paraded in front of my house at the beginning of the village fiesta. That's when i saw the Pordós. Don't know who i mean? I'd love to tell you the story, but i already told you? I've got an exam. Would you like to do it with me?