Résumé:
The most complex , as well as the most important task confronting the teacher is
meeting every student’s need .Thus , some of both teachers and students may not be aware of the existence of individual cognitive differences which affect academic achievement . This study aims to investigate the individual cognitive differences among first year learners of Ahmed Abdelghani High School in Mostaganem .In addition to raise the teachers’ awareness about these differences and to convince them using different tools , methods , and strategies in their teaching process in order to make learners study and learn equally without any discrimination. This research based on two questionnaires addressed to both teachers and learners of Ahmed Abdelghani High School in Mostaganem . The data revealed that among the reasons leading to the success of some pupils and the failure of others is the individual
cognitive differences among learners,and also the unawareness of some teachers about the existence of the cognitive differences.
