If you are intending to submit your CAO application, why not do it before the 20th of January, when you can enjoy a reduced online fee of 30 Euros( normally it’s 40 Euros.) If you leave it till after 1st of May, it will cost you online 60 Euros and Paper applications 80 Euros.
Here is some info who/what/where the CAO is…
The higher education institutions in the Republic of Ireland have delegated to CAO the task of processing centrally applications to their first year undergraduate courses.
The participating institutions retain the function of making decisions on admissions.
CAO is required to deal with applications in an efficient and fair manner.
CAO is a not-for-profit company registered in Ireland.
CAO Handbook, Click here
Full list of downloads( applications, handbook, changes etc)
Office contact hours are 09:30 to 13:00, and 14:00 to 17:15, Monday to Friday (the CAO website is monitored outside these hours to ensure continuity of online services).
Central Applications Office,
Frequently asked questions