ABDUL GAFOOR K.; SARABI M.K. Effects of Private Tuition, Time Allocation and Perceived Difficulty on Achievement in Mathematics of Secondary School Boys and Girls in Kerala. INDIAN EDUCATIONAL REVIEW, [S. l.], v. 55, n. 1, p. p. 35–51, 2017. Disponível em: http://45.127.197.188:8090/index.php/ier/article/view/3030. Acesso em: 9 jan. 2025.