The main purpose of this study is to explore the correlation between intelligence and academic achievement, self-concept and academic achievement among high school students in Jammu city. Two hundred-fifty five students (ninth graders) participated in this study. 142 of whom were female students and 113 were male students. Pearson's Product Moment Coefficient of Correlation was employed for data analysis. Results indicated that there was significant positive relationship between the variables of Intelligence and academic achievement in case of boys and girls studying in secondary schools. Furthermore, there was significant negative relationship between the variables self-concept and academic achievement in case of boys and significant positive relationship between the variables of self-concept and academic achievement in case of girls. It was revealed that with the increase in the intelligence, the academic achievement also increases in case of boys as well as girls of secondary schools. However, the variables of self-concept and academic achievement are inversely related to each other in case of boys and positively related in case of girls.