Purpose: The students' competencies of math are required to be assessed by using an international scale of evaluation. Thus, education policies and learning evaluation are developed by educational policymakers to improve the education system and result quality. Hence, the purpose of this research was to investigate The Contribution of International Mathematics Test Type and Curriculum Difference on the Effect of the National Test Score on International Mathematics Test Score. Research Methods: This study employed 600 students of private and public Junior High Schools in Indonesia. The Mathematics Test Types included were PISA-like and TIMSS-like. They were used to represent the type of test. The model of curriculums applied in Junior High School in Indonesia used in this study was KTSP and K13. The multiple regression was used to analyze the data. Findings: The National Test Score had a stronger effect on International Mathematics Test Score for KTSP curriculum implementation rather than K13 curriculum, and National Test Score had a stronger effect on International Mathematics Test Score for PISA type of International mathematic test rather than TIMSS one. These results showed that the different curriculum used at the mathematics learning process and test types had a moderate effect of National on International test score in a mathematics course. Implications for Research and Practice: It implies an increase in the policymakers to pay more attention to the curriculum design and type of learning evaluation. It is suggested that future research should include learning and teaching types to find out a deeper behavioral and attitudinal understanding of learning and teaching of mathematics.