Introduction: Children must adequately perceive their environment before they can actually develop and manipulate it. Human beings perceive their environment through their senses. To manipulate this environment, we must capture information through our sense organs and decode, process, integrate and interpret the pieces of information, so that we can act adequately in our environment. Difficulties to process or interpret sensory information will result in learning impairment. Objective: To compare the Sensory Profile results with the scores of first grade students aged between 6 and 8 years old; to observe the relation between sensory processing quality and school performance. Methods: This is a descriptive cross-sectional study. Results: Results indicate high incidence of sensory problems that interfere in the quality of muscular tonus and body posture. Visual information presented the highest processing quality, while vestibular and oral information presented the lowest processing quality. Finally, it was possible to observe that children who present sensory processing at Typical Performance and Probable Difference scores tend to present the best academic achievement. Conclusion: Sensory processing interferes in academic achievement, but this is not the only factor that predicts good school scores. The highest number of changes presented is related to vestibular information.