Sinn Féin's Education spokesperson Donnchadh Ó Laoghaire has reiterated his call for the Minister for Education to publish the algorithm used to standardise calculated grades in this year's Leaving Cert.

Mr Ó Laoghaire told RTÉ's This Week programme there is ongoing uncertainty as to how the adjustment in the calculated grades model is going to happen for every student.

His party's biggest concern was that talented students from working class backgrounds would be treated unfairly and have their grades revised downwards.

He was glad Education Minister Norma Foley had listened in that regard but he was not entirely satisfied there has been full transparency.

"We have been calling for the publication of the algorithm, the model by which the standardisation is happening, and we've been calling for that for months," said Mr Ó Laoghaire.

'It's been a rollercoaster,' say Leaving Cert students in Tralee school

Minister of State for European Affairs, Thomas Byrne, was asked about the challenges facing CAO applicants who sat the Leaving Cert in 2019 and earlier.

Around one quarter of all college hopefuls this year are presenting Leaving Certificate results from before 2020.

Some of these applicants are concerned that they are now competing at a disadvantage with this year's Leaving Cert students, whose grades will be higher.

Mr Byrne said Higher Education Minister Simon Harris had allocated an extra 1,215 places in colleges that should go some way to alleviating the problem.

"The process has been designed so there will be a standardisation between this year and previous years but it is obviously a very difficult situation," he told This Week.

The Minister said a "huge amount of outside expertise" would help ensure the system got it right.

Sinn Féin has suggested a number of possible solutions to the problem, said Mr Ó Laoghaire.

This included setting aside a number of places for pre-2020 students and adjusting the scores of the points they got in the Leaving Cert with whatever inflation occurs when results are released tomorrow.