Attention deficit hyperactivity disorder (AD/HD) is one of the most frequently occurring disorders in school children, and information and communication technology (ICT) in education is one of the tools that is lately considered as helpful for the education of some children with disorders. This research is a case study--using mixed-methods--of the contribution of an ICT-based biology course for the improvement of school achievement of an AD/HD student. Interviews and observations using two independent observers were the research tools for the collection of data, whose analysis revealed that the AD/HD student preferred the ICT lesson, during which all three characteristics of the syndrome became less intense and he was more focused on the educational procedure in comparison with other times. The AD/HD student became more positive toward the biology course and he better understood the biology concepts.