Phuong CTH, Chi TL, Hang NTM. Analysis of the reading passage difficulty and lexical demands in the Vietnamese high school graduation English tests (2015-2025). UD-JST [Internet]. 28 Tháng Hai 2026 [cited 5 Tháng Ba 2026];24(1):63-8. Available at: https://jst-ud.vn/jst-ud/article/view/10335