Sonu, a Class 12 student of the Kendriya Vidyalaya in Gole Market died on Thursday after he allegedly became unconscious and fell during the school's morning assembly, the police said.
The deceased, belonged to Bihar, and was staying with his family at the Railway Colony in Kishanganj, they said.
Prima facie, no foul play is suspected in the incident, the police said.
The police said that the boy lost consciousness and fell during the assembly. He was rushed to a hospital where doctors declared him brought dead, they said.
After being informed, a team rushed to the spot and started investigations, the police said, adding that the post mortem report is awaited.
His family claimed that he did not have any health issues and was completely fit, they added.