The 'Essential Ewan MacColl Songbook'(edited by Peggy) gives the title as 'Schooldays End' - 'Schooldays Over' in the index directs "see 'Schooldays End'"; the earlier, 'Ewan MacColl and Peggy Seeger Songbook' also uses 'Schooldays End'.
Surely the most powerful singing of the song was that of Louis Killen, Ian Campbell and (I think) Bob Davenport on the Radio Ballad, 'The Big Hewer' where it was interspersed between each verse with miners talking about their first day down the pit - that, for me, underlines the genius of this, and many of MacColl's songs.
Jim Carroll