comrádaí scoile
In what context?
Dialects in Ireland vary by region, but many Irish people do say "mate" as a slang term for friend.
duno mate
In a romantic context, m'fhíorghrá.
Mate or Mucker, mate is mainly used around Dublin (the capital of Ireland)
A common informal term for an Irish lad is "mate" or "lad."
McConoghmy School of Irish Dance
Irish School of Ecumenics was created in 1970.
Liam is a member of the Irish Coven. He has a mate named Siobhan.
Lá breithe sona duit, a fhíorghrá.
No. For primary and secondary school teaching, Irish is a mandatory subject. Primary school teachers are expected to have Irish. Exceptions can be made for teachers who are not Irish and so would not have learnt Irish in school themselves. So it is possible for teachers from other countries to work in Ireland as a primary school teacher without Irish. If the teachers are Irish themselves, then they are expected to have Irish in order to teach in a primary school. For secondary schools, different teachers would have specialist subjects, so not every teacher would be teaching Irish. So they would not need to have Irish. For other levels of education, it is not an issue at all.
If when you say Irish, you mean Gaelic, then no.