The book is most useful for research scholars, faculties of Education. It is an important learning resources and reference material for M. Ed and M.A. Education students. The book contains basically 6 chapters. In chapter-1 (Introduction) contains the concept, features, characteristics, researches in different variables self-concept, personality – traits(aggression), adolescents, Government and Private schools, objective, hypothesis and delimitation of the study. The second chapter contains review of related literature studies on self-concept, self- concept and gender, interest, academic achievement, adjustment, aggression, aggression and self-concept, level of aspiration, aspiration and achievement, researches on personality, personality and gender, adjustment, aggression, academic achievement, adolescent, personality and aspiration, self-concept and aspiration, self-concept and personality. Chapter-3 contains Research paradigm, design of the study, population and sample, procedure, tools and techniques, detail description of tools, collection of data. Chapter- 4 contains analysis and interpretation of data to measure level of self-concept, aggression and aspiration .Analysis the relationship and significant difference among boys and girls and Govt. And Pvt. School. Chapter-5 contains findings, discussion of result, suggestion and recommendations for further research. The last chapter is summary which summarizes the thesis.