; (B) be submitted to the Secretary and the State Director of Child Care and Early Learning Program Collaboration not later than 30 days after the parties enter into such memorandum; and (C) be revised periodically and renewed biennially by the parties to such memorandum, in alignment with the beginning of the school year. The requirements of the preceding sentence shall not apply where the local entity responsible for managing the public preschool program is unable or unwilling to enter into such a memorandum, and the prime sponsor shall inform the Secretary and the State Director of Child Care and Early Learning Program Collaboration of such inability or unwillingness. (g) Standards, curricula, and assessment On receiving designation as a prime sponsor, the prime sponsor shall ensure that the child care and early learning program will— (1) take steps to ensure, to the maximum extent practicable, that children maintain the developmental and educational gains achieved and build upon such gains in further schooling; (2) meet the national program standards set forth in section 121(a); (3) implement a research-based early childhood curriculum that— (A) promotes young children’s school readiness in the areas listed in section 121(a)(4)(A)(ii); (B) is based on scientifically valid research and has standardized training procedures and curriculum materials to support implementation; (C) is comprehensive and linked to an ongoing assessment and aligned with State early learning standards, within the meaning of section 637 of the Head Start Act ( 42 U.S.C. 9832 ), which is conducted not more than twice a year, with developmental and learning goals and measurable objectives; and (D) is focused on improving the learning environment, teaching practices, parent and family member involvement, and child outcomes across all areas of development; (4) implement effective interventions and support services that help promote the school readiness of children participating in the child care and early learning program involved