In this document, information is used at the student level and the Data Envelopment Analysis (DEA) to disaggregate the efficiency of students belonging to rural and urban schools of the Department of Santander (Colombia) in the knowing test 11, in the attributable part the student himself and the one attributable to the school: urban or rural.To disaggregate the efficiency, the performance of the students within the schools was analyzed to obtain the efficiency attributable to the student.Then, the performance of the students within all the schools was analyzed to determine the total efficiency of the student.The results show that students belonging to rural schools are 7% more inefficient than those belonging to urban schools.Likewise, it was found that the greatest contribution to inefficiency is attributable to schools.