You think we all had the same amount of hours in math class as a kid but you conveniently ignore variables like focus, interest and after hours practice, among others I can’t think of I’m sure.
If you took guitar class with me back in high school and only practiced during class and for assigned homework, I’m absolutely smoking you right out of the gate because I’m also spending 3hrs minimum every night practicing for fun. Double that on most weekends.
Its all about the time you put into the skill. If you are engaged with practicing a particular skill because you genuinely enjoy it, you’re going to have a much easier time than someone who struggles to enjoy it. Math class is the perfect example. Many kids loathe math class while others love it. The kids that love it are gonna engage with it with more focus both in-class and at home. That practice and study directly translates to proficiency.