Psychico College High School 1 student Konstantinos Papanikolaou, competed in the following championships as a member of the Greek Men's U16 National Water Polo Team:

• In the Elite Men's U16 European Water Polo Championships held in Istanbul on July 7-13, 2025, where he earned 5th place.
• In the Panhellenic U17 Boys' Water Polo Championship, held in Patras, during July 18-20, 2025, where he and his team earned 1st place.