The 18-year-old Welsh schoolboy was entered for A-level exams in art, English and Welsh this summer. But the head-boy at Ysgol Dyffryn Conwy, in north Wales, has not been selected by housemates for eviction since the first week of the series.
As a result, he has missed his English exams and his Welsh written papers.
He had already taken his Welsh oral exam and submitted all his art coursework.
Before entering the house, he had hoped to study Welsh at Bangor university in the autumn.
Ifor Efans, head of Dyffryn Conwy, said: "He's taken a gamble. Personally, I think he's in a win-win situation. If he does well on Big Brother, that will be a new career. If not, he could have enough points from his art and his AS papers to go to university."
Glyn, a part-time lifeguard who had never boiled an egg before entering the house, will remain Dyffryn Conwy head-boy, until another is appointed in September. He was previously head-boy at Ysgol y Moelwyn, in Gwynedd, where he sat his GCSEs.
Bethan Jones-Evans, who taught him PE, said: "He was an A* student the whole way through. I was shocked to see him go in and miss his A-levels.
But he sees this as an opportunity. He can always do them next year."
Glyn's experiences reflect the findings in Careers Wales's survey, which revealed that increasing numbers of school-leavers are going on the dole.
Experts believe some are hoping to find fame on reality-TV programmes.
While staff and pupils at Ysgol y Moelwyn have been tuning in regularly, Mr Efans rarely watches the show. But he is happy with what he has seen of his pupil.
"We're proud of Glyn," he says. "His language has been quite clean, and he gives the impression of being fairly reserved and level-headed."
And Glyn's activities on the programme, which include kissing 35-year-old housemate Lea, who claims to have the largest breasts in the country, have met with approval in his home town of Blaenau Ffestiniog.
One contributor to the BBC's online discussion forum says: "Glyn remains genuine and liked by all, a credit to Ysgol Dyffryn Conwy."
Ms Jones-Evans agrees. She says: "He's a credit to the school. He's pretty honest in the way he talks and acts with people. And he's not done anything to embarrass us. Yet."