The competition was conducted by the Science Olympiad Foundation, in association with the British Council, and involved students from schools worldwide.
For her achievement, Raka was awarded a merit certificate, a gold medal and Rs 5,000.
Raka credited the win to her English teacher and reading habits, and said she draws inspiration from her grandfather who was a writer.
“Internationally, there is har-dly any news from children studying in the Middle East. I did not expect the results to be so good,” she said.
“I see a lot of children my age sticking to smartphones and tablets, they are in a world of their own. It's time they took responsibility to do something because they are future citizens of the world.”
Once she completes her studies, Raka said she aspires to become a research analyst specialising in genetics.