Abstrak
The Study aimed to find differences in students' reading skill scores between the 2013 Curriculum and the Merdeka Curriculum for Grade X1 students at SMAN 1Nunukan and SMAN 2 Nunukan in the academic year 2023/2024. This study used the causal-comparative method for SMAN 1 and SMAN 2 Nunukan, using the purposive sampling technique. This study used TOEIC as a reading test instrument. The researchers used SPSS program version 24.0 to analyze the data. The study result showed that the impact size value is 0,428 which means a big impact size, there are significant differences between the 2013 curriculum and the Merdeka curriculum. The factors that influence the 2013 curriculum are more dominant compared to the Merdeka curriculum, the teachers in the 2013 curriculum can create a comfortable and student-centered learning environment and students utilize technology in learning English, while teachers of the Merdeka curriculum are less proficient in learning, so that students in learning English do not master the spelling of words. Based on the above, there are dominant differences and SMAN 2 Nunukan is better.