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In page Soweto uprising:

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Black South African high school students in Soweto protested against the Afrikaans Medium Decree of 1974, which forced all black schools to use Afrikaans and English in a 50–50 mix as languages of instruction.[1] The Regional Director of Bantu Education (Northern Transvaal Region), J.G. Erasmus, told Circuit Inspectors and Principals of Schools that from 1 January 1975, Afrikaans had to be used for mathematics, arithmetic, and social studies from standard five (7th grade), according to the Afrikaans Medium Decree; English would be the medium of instruction for general science and practical subjects (homecraft, needlework, woodwork, metalwork, art, agricultural science).[1] Indigenous languages would only be used for religious instruction, music, and physical culture.[2]