Completed the following sentence: At the 2015 Junior World Championships he finished eighth at best, but in 2016 he won a gold medal in relay and the silver medal in the 15 km race. Complete the following sentence: At the 2015 Junior World Championships he finished eighth at best, but in 2016 he won a gold medal in relay and the silver medal in the 15 km race. <unk> <unk> <unk>
2018 Junior World Championships, now in the U23 age class, he won the gold medal in the 15 km.