7. Shall also be exempt from the obligation to comply with the requirement set out in subparagraph 2 of section 4, any person over 16 years of age who submits to the certification board written proof indicating that he or she is registered as a full-time student in a program of studies other than that leading to a professional fishery studies diploma at an educational institution established under the authority of an Act, and written confirmation that said person works aboard a commercial fishing vessel for non-consecutive periods of not more than 5 months each.