India, May 14 -- Srishti Sharma from Haryana's Panchkula revealed that she regularly studied for 17 to 18 hours a day, sometimes even 20 hours, to secure a perfect score of 100% in the CBSE Class 10 exams.

The 16-year-old student of Bhavan Vidyalaya in Sector 15, Panchkula, only lost one mark in social science in her otherwise perfect score. However, as per CBSE's "Best of Five" rule which considers the score of the five best-performing subjects, she achieved 500/500.

"I already knew where I had gone wrong. It was a multiple-choice question and I made a silly mistake. I was bawling after returning home," she told Hindustan Times.

The Haryana teen revealed that she did not opt for any extra coaching or tuition classes like her peers and...