The Death Game

After having the first-year's final test, Mira yawned. Finally, the first ever test she met in Hogwarts has ended. She thought she did a great job on every subject except for Herbology. After all, the test has ended, no need to worry about anything.
Suddenly, an announcement came. 'Dear students, congratulations for finishing your first ever test at Hogwarts. We wish you have a great score. Tomorrow, at this same place, we will have a celebration party for your graduation of first year and for miss Hawkins' birthday.' People stared at her. Mira is excited too! After all these preparations for tests, she forgot tomorrow is her birthday! Her friend Summer came over and said,'Happy Birthday, Mira!'while giving her a great hug.
That night, Mira had a happy and sweet dream. A birthday party for her! How wonderful!
The next day, she almost jumped all the way to the great hall with excitement. The moment she stepped into the hall, everyone jumped from their seats and hugged her. 'Happy birthday!' they all shouted. All the wall, hanged some balloons. It wrote 'Happy Graduation from 1st Year' and 'Happy Birthday to Mira!'
When everyone settled on their seats, the headmaster came in. 'Hello, children! Welcome to this party! Happy Birthday, Mira!' The follow two hours are probably the best time in Mira's life! They dance and chat, they play games and eat cakes. Finally, everyone is so exhausted and is ready to return to their dormitories.
Then, someone shouted, 'The door is locked! I can't open it.'They rushed to the door, it's locked! None of them can open it. They turned back, the headmaster is gone!

A sound came from nowhere, 'Hello, kids! Welcome to the Death Game!' Students started to gasp, a girl screamed and with a stroke of green light, the girl disappeared. 'As you can see, you are not able to exit the room until the end of the game. If you lose, you die. You can scream, of course, I am just using her as an example of how you'll die. Now take a seat in 20 seconds.' Desks appeared. Students started to run, no one wants to die, of course. Mira immediately sat on a desk near her. '20, 19, 18, 17....3, 2, 1, time's up!' Two poor boys left standing, as there aren't enough desks. 'Oh, poor boys...' With two green light swooshing past, they turned into two piles of ash.
'First, let's clear up the rules. Rule number 1. No plagiarizing! Who ever breaks this rule will die immediately. Rule number 2. Do not walk or talk during the tests. This results in having a T immediately. Which also means you will die. Rule number 3. Do not damage anything from this room, including desks, paper, floor etc. Rule number 4. We have tests one for each subject, including flying. For each round the students with the poorest score or a T/D will be killed. Whoever lives till the very end will be rewarded 100 million galleons.' More gasps.
'Now, the test begins! Who wants to leave the test can go now.' One student stood up and started to walk towards the door. 'Hahaha, disobeying rule number 2, T for you!' TO BE CONTINUED