(1) A person shall not be entitled to receive supplementary welfare allowance while attending a course of study within the meaning of section 126.
(2) Subsection (1) is without prejudice to the entitlement of any person to receive supplementary welfare allowance in respect of a person referred to in that subsection who is his adult or child dependant.
(3) Notwithstanding subsection (1), supplementary welfare allowance may, in a case in which there are exceptional circumstances, be granted to a person who would be entitled to receive supplementary welfare allowance but for that subsection.