More than 2,500 students will start their delayed Leaving Cert this evening.
Biology is the first subject - with the exam starting at 5.30 pm.
They are scheduled to take place on evenings and weekends until December 11th.
Students who have already received calculated grades and decide to sit the written exams will be given the higher marks of the two.
Thousands of students were given calculated grades earlier this year instead of sitting traditional exams due to the pandemic.
However, the system faced controversy after a coding error was revealed.
Around one in ten students received grades lower than they deserved as a result
