The Third Grade Success Act requires science-of-reading-aligned instruction in grades K-3, universal screeners and benchmark assessments, multi-tiered supports and interventions for students with reading deficiencies, and third-grade promotion tied to reading proficiency. County boards must adopt high-quality core instructional materials grounded in scientifically based reading research, and three-cueing materials are prohibited. State appropriations to the Elementary Literacy and Numeracy Program fund implementation — primarily classroom assistant teachers or interventionists, science-of-reading training, and extended-time programs — distributed to counties via a state board formula or grant program; curriculum purchases are commonly braided with Title I/IDEA.