<p>Yes, it is certainly possible. And it can certainly lead to a late diagnosis, especially if you’re a female with a high IQ who has the “inattentive type” of ADHD. I was undiagnosed until midway through high school (about 4 or 5 years ago), and I always had pretty good grades (averaging in the A- B+ range). The thing is, I always struggled a lot to get those grades. ADHD manifests itself differently in different people, but for me… I was always very good at taking tests and completing papers and projects (except for science projects haha), but I was terrible at getting homework in completed, on time, or even at all. Even if I knew how to do the work, it was a huge struggle for me, and still is to some extent. When I was finally diagnosed, I was so glad to have an explanation for why it was so hard for me to be organized and focused like “normal” kids. </p>
<p>I still land in roughly the same grade range in college, but it can be agony getting there sometimes because there’s always a point in the semester when I feel like I’m about to fail. But then I take a few more tests, hand in a project or two, work with my academic coach, and things usually turn out alright. </p>
<p>I see there’s a debate on here about medication. I tried it, I didn’t think it was for me. If you’re diagnosed with ADHD… Medication might be good for you or it might not. Try it only if you want to. There’s huge comfort in just knowing that there’s a name for what’s going on inside your head and being able to read up on it and seek guidance from those who will understand the nature of the disorder and what you might be going through. Academic accommodations can also be a huge help, so if you’re diagnosed, definitely get those, whether you think you’ll need them or not.</p>