He then studied privately for his matric, and in 1978 received an honours degree in psychology through UNISA. Mabuza also served as chief executive councillor (23 June 1977 to 18 June 1982 and 9 December 1982 to 31 August 1984) and chief minister (31 August 1984 to 1 April 1991) of the Bantustan of KaNgwane of South Africa.
He then pursued individualized education for his matriculation, and in 1978 earned an honors degree in psychology through UNISA. Mabuza also held roles as chief administrative officer (June 23, 1977 to June 18, 1982 and December 9, 1982 to August 31, 1984) and chief executive administrator (August 31, 1984 to April 1, 1991) of the Bantustan of KaNgwane in South Africa.