With Tom Kirwan giving a fantastic performance from centre-forward — he struck 0-5- the Tipperary school were full value for their victory.
In a tight opening half, an early Diarmuid Ryan goal gave High School Clonmel an early boost but with Niall Sheehy, who kicked 0-5 overall, Sean Moloney and Greg Horan excelling for Tralee CBS, they drew level at 1-3 to 0-6 at the break.
The key incident in the second-half was a 48th minute goal by Sean Ryan that enabled High School Clonmel to pull clear and they were also grateful to Tipperary minor goalkeeper Evan Comerford who produced a couple of superb saves.
In Group A, Intermediate School Killorglin overcame West Clare Colleges 0-10 to 0-5 in a mediocre encounter in Glin.
After a poor first-half, the Kerry school held a narrow 0-2 to 0-1 advantage, but they produced a greatly improved display in the second-half.
John O’Shea hit 0-3, while Gary O’Sullivan and Niall O’Riordan grabbed 0-2 apiece for the winners, while Liam Madigan and Joe Downes were best for the Clare combination.
Finally in Group D, De La Salle (Macroom) overcame Coláiste An Spioraid Naoimh 4-9 to 1-12 in the battle of the Cork schools in Ballincollig.
The first-half was dominated by goals on both sides with De La Salle getting off to a dream start thanks to strikes by Cathal Vaughan and David Horgan in the 12th and 15th minutes respectively. Sam Oakes raised a green flag in the 18th minute to bring the Bishopstown school back into it, but De La Salle closed out the half with goals from Pauric Behanue and Peter Kelleher to lead 4-3 to 1-9 at the break.
Coláiste Spioraid Naoimh, who had attacker Diarmuid O’Sullivan in fine form as he notched 0-5, were only 4-6 to 1-12 adrift entering the finale. But De La Salle finished strongly with Pat Lucey, who struck 0-5, and Darren Kelly, who grabbed 0-3, to the fore.