25 C.F.R. § 30.121
(a) Once notified that it has been identified for comprehensive support and improvement, each BIE-funded school is required to develop and implement, in partnership with stakeholders (including principals and other school leaders, teachers, and parents), a comprehensive support and improvement plan to improve student outcomes that:
(b) In regard to high schools that have been identified as having failed to graduate one-third or more of their students, the BIE may:
(1) Permit differentiated improvement activities that use evidence-based interventions in the case of a school that predominantly serves students: