NGUYEN DUC SON; NGUYEN DUC ANH; LE MINH NGUYET. THE CURRENT STATUS OF MATHEMATICAL COMPETENCY AMONG GRADE 9 STUDENTS FROM SIX SECONDARY SCHOOLS IN HO CHI MINH CITY. HNUE Journal of Science: Journal of Educational Science, [S. l.], v. 71, n. 6, p. 107–117, 2026. DOI: 10.18173/2354-1075.2026-%x. Disponível em: https://hnuejs.edu.vn/es/article/view/1611. Acesso em: 15 oct. 2026.