Persistent, specific, and unexpected difficulties in the acquisition of efficient reading and/or spelling abilities (dyslexia) and mathematical abilities (dyscalculia) leads to marked impairment in school, at work, and in everyday life. Furthermore, years of academic frustration can have the effect that many affected children and adolescents encounter problems such as low self-esteem and symptoms of anxiety and depression (Carroll et al. 2005; Visser et al. 2020). The development, evaluation, and implementation of effective remedial interventions for children with dyslexia and dyscalculia is therefore of profound importance for mitigating the negative consequences for the life of affected children.