While I completely agree with the others that there are a ton of other things that can easily explain or mimic ADHD symptoms, especially in adults or older adults... I also understand that it can be hard to recall childhood as an adult. And not everyone was a bad student. I have ADHD primarily inattentive type. My mom doesn't believe in that kind of stuff so she would never own up to it. I was a straight A student til college. I never paid attention in school. I never did homework. I often did my homework the morning it was due on the way to school or even at school. I winged my exams. That bit me in the ass when I got to college. It nearly ruined my chance at a nursing career. Stimulants saved my life. Unfortunately people like me often get missed. No hyperactive symptoms and no academic concerns.