TY science
In Transition year you will be rotated between the the four different brances of science: Biology, Chemistry, Physics and Agricultural Science. Dont worry if you didnt take science for the Junior Cert, in Transition year the focus is on fun and interaction, the work will not be anything you cant handle.
There are also many different courses run for TY's by the colleges; full details of which can be found here. You would be advised to apply as soon as application opens to insure you do not miss the date and the course does not fill up.