Raghav broke the record set by Manipur's Nameirakpam Chingkheinganba, at 16 years seven months and 11 days, as recently as last month, surpassing Arjun Vajpai's feat by a week.
A student of Lawrence School, Sanawar, Raghav achieved the remarkable feat on May 21 after embarking on an arduous 56 day-long journey.
In the process, the team from one of Asia's extant boarding schools, in Kasuali, became the youngest group and the first school team in the world to reach the top of the 8,848 metres (29,029 ft) mountain range.
Raghav, initially, was not part of the school's expedition team shortlisted after testing physical and mental endurance level of the consenting students.
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"I requested our team leader Colonel Neeraj Rana to take me in the squad as I was really keen on taking up this challenge. I had to prove them during our acclimatisation sessions at Ladakh that I can summit the Everest. Then only I was allowed to become a part of this journey," he said.
"Safety was our major concern. There were some very dangerous passages during the climb. But our sherpas (local guides) made sure that everyone reaches the top safely," said Colonel P S Grewal who accompanied the team till the base camp.
The team now harbours ambitions to scale Seven Summits, the highest mountains of each of the seven continents, which is regarded as a mountaineering challenge.