What significant goal was set by the No Child Left Behind Act of 2001?

The important objective set by the No Child Left Behind Act of 2001 was to ensure that all students achieve proficiency in reading/language arts and mathematics by the 2013-2014 school year. This goal was aimed at closing the achievement gap between different groups of students, with an emphasis on accountability, standardized testing, and school improvements. The act mandated that states develop assessments in these core subjects, thus placing a strong focus on academic achievement for all students, including those with disabilities. By targeting the proficiency in essential areas, the Act sought to promote equity in education and ensure that every child had the opportunity to succeed academically.