Because there is no such thing as “natural intelligence”.

Weell, some children have it easier to comprehend stuff on the logical/abstract level than others. Which feeds their curiousity. Which trains their intelligence…

It is also not always about our intelligence but our skill set. I rarely have hard time learning when I want, but issue in my case has been in addition to probable ADHD and mental health issues that the system wasn’t designed to teach me studying.

Well you have to meet these people with down syndrome