ADHD in medical students

I don't understand how nearly half of my friends in med school have been diagnosed with ADHD. In my country, med school entrance is highly competitive, meaning you only get in if yore top 10%. It honestly makes no sense to say "I'm a top 10% student but I have an attention deficit". Those studies are 70% based on your ability to focus on material for a long time.

My friends argued that it is because they enjoy studying thus "hyperfocus" on lessons, yet most of them only started seeking treatment to improve their academic ability. So why would you need treatment for something you claim to hyperfocus on?

A competitive exam is coming up, and more classmates are getting diagnosed and treated as the date comes up. So they didn't bother seeking treatment before, making it obvious that the main area of their life they want to improve is their academic abilities.

Yet the argument that they make when I point that out is "but I also am forgetful of my things" and "I also struggle to start chores". But that wasn't something that pushed you to seek treatment before?

I'm not sure if I'm wording myself correctly. In short, I think that most med school students diagnosed with ADHD are misdiagnosed, and furrhermore I think the diagnostic criteria of ADHD is too lose and probably has awful PPV and NPV, but there is no objective gold standard to check. I looked at the diagnostic criteria and it's all completely subjective. What are your thoughts on this topic? I know I sound obtuse but only by discussing my honest thoughts I can change my opinion, if there is reason to change it