In the literature, less is known about the influence of emotions on cognitive performance at the crucial period of early-and mid-adolescence. Although the results are sometimes contradictory and contingent upon the perceived specific emotion in adulthood, the affective state is likely to influence cognition. Moreover, affective context is likely to impact deductive reasoning in youth and decision making. There is evidence that a negative affective experience will lead to poor cognitive performance. Therefore, experiencing a negative emotion (anger, anxiety, sadness…) should weaken the performance of students in cognitive tasks (e.g., reasoning or decision-making task). However, few studies have examined the impact of emotions on cognitive (not only academic) performance among adolescents and this is the objective of our research. After ethic committee agreement and parents' authorization, we asked 158 adolescents in secondary schools to respond to several questionnaires. More precisely, we proposed the French version of Differential Emotion Scale adapted for school context to measure the affective states. Syllogisms evaluated cognitive nonacademic performances. As results, we expected that negative emotions related to academic achievement would reduce performance in reasoning and positive emotions would improve it. There was only a significant effect for positive emotions on performance in reasoning Moreover, we tested the existence of differential effect of affective state on cognitive performance. according to age but it wasn't significant. The impacts of the results as well as perspectives of future research in relation with self-esteem, psychological disengagement and dropping out of school will be discussed. This research is funded by the French National Research Agency (Agence Nationale de la Recherche): ANR-18-CE28-0004-01.