A gang of bullies filmed themselves setting fire to a schoolgirl's GCSE coursework, destroying years of hard work in seconds.
Rhiannon Blair, 15, was left in despair after the bullies poured lighter fuel over her notes and set light to it.
To compound her shock, the gang then sent the teenager the video of their so-called prank.
Police are investigating the incident after the footage was posted online, but confirmed there had been no arrests so far.
Rhiannon told how she burst into tears after being sent the cruel video and now has fears over her future job prospects with her place on a college course in September now in jeopardy.
She told her local paper: "I was shocked and disgusted when I was sent the video by one of the pupils involved. None of them seems to be sorry for what they have done or show any regret.
"I am just very upset and tearful that all my hard work has gone to waste.
"I have always wanted to work with children and it is what I had set my heart on doing for the rest of my life. I am not even sure if I can get a place on my course at the college anymore. I can't understand why anyone would do this."
Rhiannon, who wants to be a nursery nurse, is a student at Easthampstead Park Community School in Bracknell, Berkshire, and was just two weeks away from submitting the coursework.
She said she had been the victim of bullying since last September and had suffered from anxiety and depression as a result.
Her mum, Debbie Groom, said: "I am so angry. These pupils have ruined my daughter's life. I would be mortified if that was my child carrying out that sort of behaviour.
"This incident is going to scar Rhiannon for life. She has been very stressed and upset but the reaction to the video being posted online has been amazing - it just shows that people do not like bullies."
Another pupil at the school, 15-year-old Kayleigh Holloway, also had her child development coursework destroyed.
Headteacher Liz Cook said letters had been sent out to everybody involved in the incident and that none of the pupils' grades would be affected as the exams board had measures in place to protect results in such circumstances.
She said: "The school has investigated the incident at length and its origins were a falling out between girls, property was taken as a spiteful act designed to disrupt the victim's lesson the following day.
"On leaving school, discussions between students took the original act further in an act of bravado.
"On reflection students have realised this act was a huge error of judgment on their part and have been shocked that their act has attracted a social media storm. This has been a steep learning curve for them all.
"The victims of the theft are also being supported as we make every effort to make sure their hard work and studies are not compromised.
"I hope for our students' sake that we will be able to put this incident behind us and the focus will move on to the very many students I have in school whose talents and abilities deserve to be recognised for the good they do."