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In this paper we explain student-sperformance index on Mathematics Department UNP. Fluctuation on student-sperformance index describe the academic achievement of student. Many factors contribute to this case. Based on some research, it influenced by family environment, learning motivation, college environment, and student-s perception to the lecturer. So, we need a confirmatory analysis to test or confirm the measurement model which is build based on hypothesis used. The result is performance index of a student influenced by family environment, they are parents guidance, home atmosphere, economics factor on a family. Learning motivation factor include feeling happy on a lecture, interest to the topic, pay attention and student-s involvement to the lecture. Campus environment factor is facilities and infrastructure on university and facilities on learning room. Student-s perception factor is like and dislike factor of students to the lecturer, evaluation system chosen by lecturer, and also learning strategy of lecture.