Special Provisions
(1) The Fifth Schedule's provisions apply to administering Scheduled Areas and Scheduled Tribes in states other than Assam, Meghalaya, Tripura, and Mizoram. (2) The Sixth Schedule's provisions apply to administering tribal areas in Assam, Meghalaya, Tripura, and Mizoram.
India uses two different constitutional frameworks for administering areas with significant tribal populations, depending on region: the Fifth Schedule applies to Scheduled Areas in most of the country (giving Governors special powers and creating Tribal Advisory Councils), while the northeastern states of Assam, Meghalaya, Tripura, and Mizoram instead use the Sixth Schedule, which creates more autonomous, self-governing District and Regional Councils with real legislative and judicial powers.
This is why a tribal area in, say, Jharkhand or Odisha is governed under the Fifth Schedule's framework (special Governor powers and Tribal Advisory Councils), while a tribal area in Assam or Meghalaya might instead have its own genuinely autonomous District Council with its own legislative and judicial functions under the Sixth Schedule - two quite different approaches to protecting tribal self-governance.