Explanation:

Only statement 2nd is correct.

• The National Achievement Survey (NAS) is a nationwide survey to assess the learning outcomes and health of the education system.
• It is the largest, nationwide, sample-based education survey conducted across India.
• NAS is a triennial Survey (and not a biennial survey) undertaken by the Ministry of Education.
• The Central Board of Secondary Education (CBSE) conducted NAS 2021.
• The National Council of Educational Research and Training (NCERT) designed an assessment framework and tools for NAS-2021.

Key highlights of the NAS 2021

• It recorded a decline in performance in almost all subjects.
• The average performance of schools in rural areas remained “significantly below” those urban areas in same states and union territories (UTs).
• The performance of students from the schedule caste (SC)/ schedule tribe (ST)/ Other Backward Classes (OBC) categories remained lower than that of students from the general category.
• The average performance of girls remained better than the boys in almost all subjects.

Hence option 2nd is correct.