4. Every board shall receive, for each of its students whose grade corresponds to an eighth or ninth year of schooling, an additional grant equal to that provided for in section 3; every board shall also receive, for each of its students whose grade corresponds to at least a tenth year of schooling, an additional grant equal to one and one-half times that provided for in section 3.
R. S. 1964, c. 237, s. 4; 1966-67, c. 65, s. 2.