Historically a tall order
Past experience shows that this is easier said than done.
In response to a question in the Lok Sabha in August 2014, Kiren Rijiju, the then junior minister in the home ministry of the earlier NDA government, had listed the possible reasons why the three-language formula was not implemented effectively. One of the reasons given was that Hindi-speaking states did not include any South Indian language in their school curriculum. Rijiju had informed Parliament that Hindi was not taught only in Tamil Nadu, Tripura and Puducherry. Tamil Nadu follows a two-language formula -- Tamil and English. Meanwhile, he had informed, "In many of the Hindi-speaking states, Sanskrit became the third language instead of any modern Indian language (preferably south Indian language)."