Premkumar participated in the 2012 Asian Indoor Athletics Championships that took place in Hangzhou, China. He won a bronze medal and set the national indoor record with a jump. The previous record was held by Maha Singh, who jumped at the 2006 Asian Indoor Athletics Championships in Pattaya, Thailand. Premkumar was the only Indian to win a medal at the championships. He competed in the 2012 World Junior Championships in Barcelona, Spain and finished 16th in the qualification round with the best jump of , which was not sufficient to qualify him for the final. He set his personal best of at the National Inter-State Championships in Chennai in June 2013. A month after the championships, Premkumar won a silver medal at the 2013 Asian Athletics Championships in Pune with the best jump of .