Botha initially attended the Paul Roux School and matriculated from Voortrekker Secondary School in Bethlehem, South Africa. In 1934, he entered the Grey University College (now the University of the Free State) in Bloemfontein to study law, but left early at the age of twenty in order to pursue a career in politics. He began working for the National Party as a political organiser in the neighbouring Cape Province. In the run-up to World War II, Botha joined the Ossewabrandwag, a right-wing Afrikaner nationalist group which was sympathetic to the German Nazi Party; but months after the German attack on the USSR, Botha condemned the Ossewabrandwag and changed his ideological allegiance to Christian nationalism.