1) The document discusses the use of mother tongue as the medium of instruction in schools. It notes that using one's native language facilitates better learning compared to a second language.
2) Examples are provided of the languages used for instruction in some of the top-ranked countries for literacy. Most use the primary local language, with some offering additional languages.
3) An overview is given of the languages used for instruction in different South Asian countries, including India, Sri Lanka, Bangladesh, and Pakistan. In Pakistan, the medium varies by province.