Her brother told the Mirror, "We realized about 3 am that our flat had been destroyed and despite being at a friend's house, my sister couldn't sleep, so she studied for the exam instead".
Ines Alves, just 16, had been up late revising for her exam on Tuesday night when her father Miguel noticed there were plumes of smoke coming from the fourth floor. I want to do A-level chemistry and I need an A in science so I was thinking of my future when I made a decision to sit the exam, ' Alves told the Mirror. However, given the circumstances, she thought the exam went okay.
After taking the exam, she met the rest of her family, her parents, Miguel and Fatima, and her brother Tiago to help other families whose lives had been upturned by the devastating fire.
"I just wanted to do all I could to help and I wanted to see my friends, who were also helping".
Ines was still wearing the same clothes she had escaped in, but was determined to sit the test after studying hard.
She added: 'I'm devastated that my house burnt down but even more devastated at the amount of people who died'. "She said it went well, and my sister is a smart girl, so if she said it went well, it did".
Tiago, who also lost all of his possessions in the inferno, added: "We aren't anxious about what will happen".
Having looked up pupils' addresses on the school's database, her teachers already knew when Ines arrived that she had been affected.
Despite being unable to sleep as her home was destroyed in the fire, the 16-year-old still turned up for her GCSE chemistry exam at Sacred Heart School in Hammersmith later that morning.
Emergency services now reportedly fear the death toll could rise to more than 100 as firefighters still battle to reach victims on the higher floors of the 24-storey building.
Police said there were still 37 people in hospital on Thursday morning, with 17 in critical care.
Dany Cotton, the London Fire Brigade commissioner, said: "This is an unprecedented incident".
Ms Cotton has also warned firefighters attempting to rescue residents entrapped in the Grenfell Tower blaze were "in tears" and might be faced with psychological issues in the future.
After she and her family lost everything in the tragic London fire, this teen chose to sit through her exam the next morning no matter what.