Cheat

This is my first campfire so suggestions are welcome!
I'm more of fantasy. I'll start a fantasy campfire after this.
Here are the rules. Please do not go against them! :)

The plot is about these two girls who are best friends and one of them cheated in an examination, and got caught. She managed to convince her best friend that it's not her who cheated, and even made her siblings(invent as many as you want)believe her. The teachers found the answer sheet under the innocent best friend's desk, and confronted her. Since they have no further evidence of the innocent best friend cheating, they decided to survey her closely. When evidence leads to the other best friend, she desperately started shifting the blame to her best friend.

You can add on as many twists as you like but please stick to the plot. You can add on new characters but two girls are necessary. The guilty best friend's personality is a very pressurized one. The scholarship means a lot to her. You can add on different characteristics for her personality but please do not leave out the part about the pressurized personality.

The other best friend is quiet and ladylike. The rest is for you to invent.