Keet attended the South African College School (SACS) in Cape Town during that war and then completed studies for the degree of Bachelor of Arts at the South African College, in the same city. In 1907 he entered a theological college, where he was involved in the management of the Afrikaans Language Union (De Beer 1992:10–21, 33). From January 1911 to 1913 Keet was enrolled at the Free University in Amsterdam, where he worked towards a doctorate under the guidance of Herman Bavinck (De Beer 1992:40–41).