The High Court is expected to issue a judgment towards the end of next week in a challenge taken by a Leaving Certificate student against his exclusion from the Calculated Grades scheme.
The court was told that Elijah Burke, from Co Mayo, who has been taught entirely at home by his mother, cannot receive calculated grades because there is no objective record of his academic attainment at any level.
Lawyers for the Minister for Education said there could be no circumstances whereby the Department of Education could stand over a situation whereby a parent's judgement only was used as the basis for grades.
Like his nine siblings, Elijah Burke's entire education has taken place at home with his mother as his sole teacher.
Yesterday, the court was told that he was demonstrably gifted and and that all his siblings had excelled academically.
But lawyers for the Minister for Education said today that there was no objective measure of Elijah's academic excellence.
He had not taken the Junior Certificate for instance, and the only record of his attainment had been created by his mother.
They said the case was not about depriving the applicant of a third-level education because it is intended to proceed with Leaving Certificate exams in November and Mr Burke could sit the exams then.
Under the calculated grades system teachers create an estimated mark for each student, and also ranks students in order.
However, teachers who are close relatives of a student must stand aside from the process and allow another teacher within the school to take over.
This 'mark' will later be used to calculate a final grade under a national standardisation process being undertaken by the Department of Education.
The case before the High Court has now concluded.