In this article the elements of crisis of a sociology are described, which deserves the emergent possibilities of new logics to understand the complexities through the concepts and categories different to the own nature of the social discipline, it means,

Academic achievement refers to a student's success in meeting short- or long-term goals in education.  In the present study for comparing the academic achievement of secondary school students of single-sex schools and co-educational schools a sample of 160 students was selected from different school of Hisar district. In the study academic achievement was dependent variable and school type was independent variable. Previous year result from the school record was used to assess the academic achievement. Result revealed that the 40% student of rural area studying in single-sex school have low academic achievement, 32 percent student have  fall in medium category and only 27.50 percent student have high level of academic achievement.  45% student of rural area studying in co-educational school have medium academic achievement, 30 percent student have  low academic achievement and only 25 percent student have high level of academic achievement. Result further revealed that the 50% student of urban area student studying in co-educational school have medium academic achievement, 37.50 percent student have  low academic achievement and only 12 percent student have high level of academic achievement. 50% student of urban area student studying in co-educational school have medium academic achievement, 37.50 percent student have  low academic achievement and only 12 percent student have high level of academic achievement. The mean academic achievement score of student belonging to single-sex school of rural and urban area (356.05 and 358.82 ) and the score of student belonging to co-educational school is  (371.77 and 373.67) it leads up to conclude that the student belonging to co-educational school have better academic achievement as compare to the student belonging to single-sex school.