Eamon Ryan, a teacher from Scoil Dara in Kilcock, said teachers are worried.
Over 30,000 secondary school teachers will down tools and hold a lunchtime protest at schools today.
They're opposing plans to speed up the overhaul of the Leaving Cert.
Teaching unions believe the faster pace of reform will be done without the proper resources or training and will lead to inequalities among schools.
Teachers argue that more time is necessary to assess the structural readiness of Ireland’s secondary education system before moving forward.
Organisers have stressed that the protest is designed to minimise disruptions, with demonstrations taking place during lunch breaks to avoid impacting students’ learning time.
Eamon Ryan, a teacher from Scoil Dara in Kilcock, said teachers are worried.
"We are committed to curriculum change which promotes equality, enhances students’ education and protects education standards. We are very concerned by the decision to accelerate Senior Cycle redevelopment; a process that involves significant change, including changes to the Leaving Cert," he said
He added: “Teachers are asking that schools are allocated the required resources before the implementation of these significant changes. In addition, the revision of Leaving Cert subjects must not be rushed through, so as to ensure changes are educationally sound and, crucially, that Leaving Cert students can be assured of equity and fairness.”