What types of special provisions can the state make under Article 15(6)?
The state can make special provisions under Article 15(6) for:

1. The advancement of any socially and educationally backward classes of citizens or for the Scheduled Castes and the Scheduled Tribes.
2. Any special provision, by law, for the advancement of any socially and educationally backward classes of citizens or for the Scheduled Castes or the Scheduled Tribes in so far as such special provisions relate to their admission to educational institutions including private educational institutions, whether aided or unaided by the State, other than the minority educational institutions referred to in clause (1) of article 30.
3. Any special provision for the advancement of any economically weaker sections of citizens other than those mentioned in clauses (4) and (5).