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. 2019;6(1):78-86. Accessed April 26, 2026. https://journal.unilak.ac.id/index.php/BL/article/view/2696