241.3. In the case of a student who has not achieved the objectives and mastered the compulsory notional contents of elementary school education at the end of the period fixed by the basic school regulation for the mandatory promotion to secondary school, the school board may, following a request giving reasons therefor made by his parents and subject to the terms and conditions determined by regulation of the Minister, admit him to elementary school education for an additional school year, if there are reasonable grounds to believe that such measure will enable the child to join a regular class at the secondary level.