Literacy-based Promotion Act; revise to expand intervention and strategies for literacy proficiency among students in Grade 4 through 8.

HB 857 expands Mississippi's literacy program to support students in grades 4 through 8 by requiring evidence-based reading instruction and interventions. It mandates annual universal reading screenings for all students in these grades, professional development for teachers focused on the "science of reading" (including phonics and decoding), and prohibits the use of "three-cueing systems" for teaching word reading. The bill also creates a system to identify "Middle Literacy Support Schools" based on reading data and requires the state education department to develop a structured literacy course for grades 6-8. Schools must provide targeted interventions for struggling readers, and the department must submit annual implementation reports to the legislature.