In the last two decades, the brazilian government has invested huge resources to promote the access to the information and communication technologies at the public schools. The regulatory instruments which establish such policies indicate as a major objective, the improvement of the student s academic achievement, from the educational use of computers, Internet, and other tool which are used daily, in the information society context. In this work we investigate possible correlations between the ICT use at brazilian public schools, and the results of these same schools in the national test of academic achievement. Our start point are the results of Prova Brasil 2011, and the data collected in the same year, by the TIC Educação, research realized by the Brazilian Internet Steering Committee. In the case of this second process, we have considered the interviews applied to the teachers of fifth and ninth year, of the basic level, from what was developed two indexes to measure the educational ICT use for each school. These indexes were developed from statistical models, using the Item response theory.