Pres loooked a team of considerable talent from the time they jumped into an early 14-0 lead after superbly taken tries by Harry Dillon and stylish full-back Jonathan Wren.
Wren crossed for his second try before the half time whistle and with all three converted by Peter Sylvester, the game was essentially over as a meaningful contest.
Ardscoil stepped up considerably on the restart and their scrum-half and captain Craig Casey grabbed a try.
But Pres were not to be stopped and further tries follosed from Mark McCarthy, Sam O'Donovan and Darragh O'Callaghan.
All but one of the six tries were converted by Sylvester.