It was the last wicket pair of Azar Williams and Solomon Bascombe who took the Grammar School over the line.
The duo came together at 47 for 9, and inched their way to 64 with no further loss in 17.5 overs.
Grammar Schoolâs total was buffed by 30 extras conceded by the Georgetown Secondary.
Iruel Matthews had threatened to bowl his team to victory, taking 7 for 17; however, he did not get the support from the other end.
The Grammar Schoolâs task was to overhaul the Georgetown Secondaryâs total of 59 all out in 20.4 overs.
The bowling efforts for the St Vincent Grammar School saw Jawanza Woods taking 3 for 11; Luke Wilson- 2 for 11, Solomon Bascombe â 2 for 16 and Azar Williams â 2 for 17.
Last Mondayâs final was a reconfigured one, after the St Martinâs Secondary had originally secured a place; however, that school withdrew after it was revealed that they featured players over the stipulated age.
The Sandy Bay Secondary won last yearâs competition.
This is the second victory for the SVGS in four days, the school having last Thursday won the Male Division of the Inter Secondary Schools Athletic Championships for the sixth consecutive year.