The main goal of this study was to examine whether children who self-assess that they have significant symptoms of attention deficit / hyperactivity disorder, the severity of symptoms of hyperactivity, impulsivity or inattention, given the level of boredom and wandering thoughts during the class compared to children who self-assess pronounced symptoms of ADHD. The study involved 104 students (40% boys and 59.05% girls and one student who did not complete the gender) of fifth, sixth, seventh and eighth grades from one primary school. Students completed the Hyperactivity-Impulsivity-Attention Scale (HIP; Vulić-Prtorić, 2006), the Boredom Proneness Scale (SDN; Trogrlić and Sorić, 2014) and the Mind Wandering Questionnaire (MWQ; Perković Kovačević et al., 2020). It was found that children who show significant symptoms of hyperactivity, as one of the symptoms of ADHD, are more bored and have more wandering thoughts, the same result was obtained for impulsivity, while no statistically significant difference was obtained for the symptoms of inattention, and students, regardless of the symptoms of inattention, are equally bored and equally wandering in their thoughts. No gender differences were also found in terms of boredom and wandering thoughts during class. So, both boys and girls are equally bored and their thoughts wander equally. We can conclude that the symptoms of ADHD still have a connection with the two constructs, but also that simply inattention does not present to students as much a problem as hyperactivity and impulsivity, in terms of boredom in class.