The magazine "Singithi" was published when he was in the fifth class. Two of his articles were also published in "Singithi" Magazine in 1965. Mahinda passed the competitive examination and selected to the Maha Vidyalaya in 1966. Politically, he was a leftist. Piyasena was well versed in arithmetic. The house later became a meeting place for JVP leader Rohana Wijeweera and his members, and Mahinda's elder brother Sunanda was the youngest leader in the discussions. Sunanda was one of the main suspects in the 1971 JVP insurrection led by Wijeweera and was the fifth suspect in the case. He later became the editor of the "Yukthiya" newspaper, and a well-known journalist. During the 1970s, Mahinda also contributed generously to his brother Sunanda's work and was instrumental in spreading revolutionary ideas among the students.