Almost two-thirds of second level schools are considering dropping one or more subjects from their Leaving Certificate programme as a result of Budget 2012 education cuts.
The figure comes from a study commissioned by the Association of Secondary Teachers Ireland ahead of its annual Easter conference.
The subjects most likely to be dropped are accounting, chemistry, physics and economics.
The study showed that 57% of schools indicated they are likely to amalgamate some classes at Leaving Cert level.
The research on the impact of education cuts since 2009, carried out by Millward Brown Lansdowne for the ASTI, is based on responses of 151 principals.
It also found that 47% of schools surveyed have already dropped one or more subjects at Leaving Cert level as a result of cutbacks implemented since 2009.
In response to the survey, the Department of Education said that while changes were made to the teacher allocations that post-primary schools will have for the new school year in September, it is premature to speculate as to how this will impact in individual schools.