Unveiling the Relationship between Internal Assessment and External Assessment in the International Baccalaureate Diploma Program

This study aimed to explore the relationship between internal assessment (IA) and external (EA) scores of high school students in International Baccalaureate Diploma Program (IBDP). Methods: Simple linear regression analysis was conducted what extent IA predict EA Turkish, English, Physics, Chemistry, Biology Mathematics courses. Findings: The quantitative revealed that only a small percentage variation IBDP can be explained by model containing standard level (SL) (HL) Furthermore, correlation coefficient utilized explain degree which are associated with scores. there is moderate HL English SL biology course, but weak biology, chemistry, mathematics, physics, (only SL) Turkish Value: research highlights some important implications for educators about consistency reliability as tool forming final mark role plays predicting students’ general academic achievement.