EFFECT OF MULTI-GRADE TEACHING ON STUDENTS’ COGNITIVE ABILITIES IN MULTI-GRADE LITERACY CENTERS OF PUNJAB . Pakistan Journal of Society, Education and Language (PJSEL), [S. l.], v. 7, n. 2, p. 172–181, 2021. Disponível em: https://jehanf.com/pjsel/index.php/journal/article/view/482. Acesso em: 16 apr. 2026.