After successfully completed his GCE Advance Level examination he entered the Science Faculty of University of Peradeniya, studying chemistry.
[5] He obtained his second PhD degree for his published work, 'Democratic Governance in Sri Lanka: A Constitutional Miscellany' from the University of Colombo Although Wickramaratne was a leftist [6][clarification needed] in 2015 August election he was appointed as a national list MP from the right wing UNP.[when?]
As he was a key architect of the 2015 Nineteenth Amendment which prohibits non-citizens from entering parliament or contesting in Presidential elections.
It was specifically aimed at preventing Gotabaya Rajapaksa, at the time an American citizen, from entering Sri Lankan politics or running for president.
[7] The 2015 constitution which he participated to draft was abolished on 22 October 2020 and a new amendment was passed at the Sri Lanka parliament.