375. The decision made by the Minister under the first paragraph of section 374 shall have effect for the unexpired portion of the then current school year and for the two subsequent school years. Thereafter, the number fixed by the Minister shall remain the same unless all the school boards that form part of the regional school board apply to the Minister for a review of his decision made pursuant to the first paragraph of section 374. The decision of the Minister on such application comes into force on the thirtieth day following the day of its publication in the Gazette officielle du Québec.