For an operating transfer to the Twenty-First Century Education Trust Fund established in
section 35NNN of chapter 10 of the General Laws; provided, that funds may be used for effective and sustainable improvement initiatives in public schools designated as in need of assistance pursuant to the school accountability system established by the board of elementary and secondary education, and for the purpose of addressing persistent disparities in achievement among student subgroups, improving educational opportunities for all students, sharing best practices for improving classroom learning and supporting efficiencies within and across school districts