; (B) an assessment of any impact of the pilot program on student achievement; (C) an accounting of the purposes for which the grant funds were expended; and (D) any additional information the Secretary reasonably requires. (2) Report to Congress Not later than three years after the end of the first fiscal year in which a grant is awarded under this section, the Secretary shall submit to Congress a report on the effectiveness of the grants. Such report shall include— (A) an estimate by the Secretary of the amount of money saved by students who participate in the pilot programs; (B) a summary of the best practices developed in the pilot programs; (C) a description of the types of digital course materials used in the pilot programs, including electronic books, interactive and adaptive digital learning tools, and open educational resources