He was also awarded the "Achievement Medal" by the International Federation of Bodybuilding and Fitness (IFBB) in 2003 for winning its World Middleweight Champion title in 1988.
Prem made his national debut by claiming a Bronze Medal in Middle-Weight Class at Darjeeling in 1980.
He began his international career by securing the title of Mr. Asia in Middle-weight Class at Karachi in 1983, a feat he was to repeat at Seoul in 1984.
Subsequently, he switched over to Light Heavy-weight Class in the Mr. Asia contest, winning the title at Colombo in 1985, Taipei in 1986, and Malaysia in 1987.
Five years later, he returned to win the Gold in Light Heavy-weight category of Mr. Asia championship held at Delhi in 1996.