Section 57. The board shall establish an instructional materials grant program to provide financial assistance to school districts for the purchase of textbooks, workbooks, audio-visual materials, library books and materials, laboratory kits, and other instructional materials. Grants shall be awarded to those districts in need of assistance as determined by the board following inventories of such materials conducted by the board from time to time. In awarding grants under this section, the board shall give priority to school districts receiving equal educational opportunity grants pursuant to chapter seventy A.