This study aims to determine the achievement motivation, student perceptions about the principal leadership style and teacher competence, student discipline, and mathematics learning outcomes, the influence of achievement motivation, students' perceptions of the principal leadership style and teacher competence, the results of learning mathematics either directly or Not directly through the discipline of students of class X SMK Negeri 2 Majene. This type of research is ex post facto that is causality. The population of this study are all students of class X SMA Negeri 2 Majene lesson 2015/2016. The technique of determining the sample is done by using proportional stratified random sampling. Instruments in this study using questionnaires and tests of learning outcomes. Data were analyzed by descriptive and inferential statistics of SEM (Structural Equation Modeling) method. The results showed: (1) Student achievement Motivation X Grade SMK Negeri 2 Majene is in the high category, students 'perceptions about the leadership style of headmaster are in the medium category, students' perceptions about teacher competence are in high category, student discipline is in high category Dan The results of mathematics learning are in the medium category; (2) Achievement motivation has positive and significant effect on mathematics learning result, either directly or indirectly through student discipline. (3) The students' perceptions about the leadership style of principals are not significant on the mathematics learning outcomes, and positive and significant achievement of mathematics learning outcomes through student discipline, (4) students' perceptions of teachers' competence have a positive and significant impact on the learning outcomes of mathematics, Directly or indirectly through student discipline