Its president, Laois' Reuban Murray, says an alternative format is needed this year.
The Irish Second-Level Students' Union is calling for the standard Leaving and Junior Certs to be scrapped this year.
It has written to Education Minister Norma Foley, calling for an alternative format for 2021.
Schools are closed until at least January 31st - but the Minister says she intends to run the exams as planned in June.
But the union's president, Mountrath student Reuban Murray, says that's not practical:
Reuban says teenagers are under serious mental strain at the moment: