THE RELATIONSHIP BETWEEN ANXIETY AND RETENTION TOWARDS LEARNING ACHIEVEMENT REMEDIAL ON MATERI SKELETON SYSTEM IN CLASS VIII SMP NEGERI 30 PEKANBARU ACADEMIC YEAR 2018/2019. Bio-lectura [Internet]. 2019 Apr. 25 [cited 2026 Apr. 26];6(1):78-86. Available from: https://journal.unilak.ac.id/index.php/BL/article/view/2696