The differences between symptom presentation are very apparent in the school setting. A boy with ADHD generally struggles with noticeably disruptive behavior and therefore, may sooner receive testing, diagnosis, and treatment. Girls, on the other hand, struggle differently. And because their challenge can often be with attention, poor grades and forgetfulness, an ADHD diagnosis can be harder to spot. Be aware of these symptoms and the different ways they can affect boys and girls. It is important to note, highly intelligent girls with ADHD are often the most difficult to spot. The brighter a girl with ADHD, the later her difficulties tend to emerge. In fact, many girls with above- average IQ manage academically. However, as life becomes more demanding and complicated, challenges with concentration and organization begin to emerge.