Michael took Mods (or Moderations) in Latin and Greek, the first part of the Classics degree course known as Literae Humaniores (also known as Greats) and yes, he did seriously think of studying art in Paris instead of going to Oxford, but Barrie dissuaded him from taking that path. (Michael was again tempted the following year but changed his mind.)
By 'school', I assume you mean college/university years? Michael went to Oxford in January 1919. I think a Classics degree requires 4 years so by the time of his death in 1921, he had only done 2 years.