In Slater's 1870 there are four schools listed under the section for Fethard (on-sea). This section of the directory also covers Arthurstown/King's Bay, Ballyhack, Duncannon and Saltmills.
Church Educational Society's School, Arthurstown
Edward Meredith, master
National School, Ballyhack
Mary McCabe, mistress
National School, Duncannon
Manin Roache, master, Mary Dowling mistress
Parochial School, Duncannon
Margaret McKergin, mistress
I think the National Archives may have some National School records.
Shane