which school did he pass out from?
Sydney Grammar School
Lester Brain
He completed his education at Sydney Grammar School, where he excelled in maths, before being employed by the Commercial Banking Company of Sydney (CBC) in 1919.

who was lester brain? Australian aviator and airline executive where was he born? Forbes, New South Wales, Australia
wiki:136992
Lester Brain [SEP] Early life
Brain's fellow attendees included Royal Australian Navy lieutenants Joe Hewitt and Ellis Wackett, and Australian Army lieutenant Frank Bladin, all of whom were seconded—and later permanently transferred—to the RAAF.