45. Notwithstanding sections 42, 43 and 44, an institution of vocational education which holds a permit may, in accordance with the regulations, provide intensive instruction comprising only the courses of vocational training contemplated in the official curriculum or in a curriculum recognized under section 43 or approved under section 44, as the case may be, provided that it admits thereto only pupils who have, where necessary, met the requirements of section 256 of the Education Act (chapter I-14).