The equation that contradicts with all laws of mathematics

Today, I got my Science paper back and I got 79%. This was really a smack in the face for me since I usually get 90 plus. Well, no big deal, we learn from mistakes and I will definitely learn from this so to guarantee a better score in PMR. BUT, my Science teacher makes a "juicy" offer of 2 marks if I hand in one whole book of completed extra exercise because all my other classmates got 80 plus.....which means I am the last in the class*_*. And the most annoying thing is that she announced it to the whole class. Being mad and humiliated, I stubbornly rejected. Later, I proved that she counted the marks wrongly.

Seems like I won't be needing her generosity after all.

Another interesting thing that happened today is that I called Kwan Hui and Jia Qian by the name of Zhao Yi x_x. They happened to be the only two girls I called by name today and I called them both wrongly. Zhao Yi please forgive me, I guess my tongue is forever doomed to speak your name because i keep insulting you all the time.