Luke Kelly, Mary Black & the Chieftains, and other artistes who have recorded the song, use title "Schooldays Over". Many others call it "Schooldays End". Both titles seem to be viable, and perfectly identifiable.

"Schoolday's Over, Come on Then, John..." is the title that appears in online list of "Ewan MacColl Lyrics" by "Lyrics.com" (but this seems imperfect -- what is the precise use of the apostrophe here?).

It would seem, in sum, that there is no consensus as to which of these two alternatives constitutes the definitive title; but little or no difficulty or confusion will surely be caused by the use of either.

≈M≈