Hi Ainslie
Have you come across this post about JJ Stroud by Lynley Chapman? Doesn't really answer your question, but there are some more dates for his time in NZ.
Also, as he was in WW1 there is a personnel file for him that can be ordered from Archives NZ: See his entry on Archway entry here
This may include info about his education.
If he was employed by the Army after the war, as Lynley's post implies, there may be further records among in Defence files at Archives.
cheers
Jamie Mackay