What high schools are teaching multi variable calculus definitely wasn't the ones in my area. Calling people geniuses when they have had access to better resources is crazy.
No one does this at a high school. They take classes at a local two-year or state school while in high school then use the knowledge gained to chump you later on.
If they are acing the fresh calc exam, it's because they were exposed to those concepts three years ago while everyone else is learning for the first time.

It sounds simple but it's not. Google asks leetcode hards. You have to be very smart to work at Google. Even just understanding the question on some of the leetcode hards can be difficult. But when you focus on the top 1% of people yeah they'll make others look mediocre
I don't believe dude has ever worked there or at any similar shop.
Nobody in my high school or the surrounding high schools were attending college classes. I was friends with multiple valedictorians they didn't attend college in hs because the opportunity wasn't there.
Their parents, your parents, they didn't know any better, that's the point. They think, "my kid was on the honor role" or being valedictorian at a podunk school means something.
Or be an asian from california I assume that's probably most of the battle.
Not just Asians, not just California. Jersey suburbs, New York, Massachusetts, Maryland. College towns. Really places where people take cultural institutions seriously.
Jews and legit Catholics are good at it, especially when it comes to law, etc.
Somalians, Nigerians, and Ethiopians are especially good at it too.
People who take the raising kids game seriously set their kids up to compete and succeed from a young age.
From what I understand is both of her parents are traditional Engineers and in addition to her schooling offered a lot of Math and Physics insights to her while she was in Elementary school and High School. It may have been her or another YouTuber I’m confusing her with. I know for sure her father is though at least.
When you think about it, even in Private schools most Elementary school teachers’ highest level of Math is maybe Pre-Calculus. Getting to learn Physics and Math from parents who’ve taken 4+ years of it in college, including many Upper Division courses that apply it who then work on Engineering everyday has a lot of insights with these subjects at an intimate level that they can pass on.
In addition, both parents being Engineers means she probably has some innate ability at it more than most kids.
Wait. Yesterday you were arguing the genius angle, now you're repackaging all of my arguments as your own. Are you Indian?
I'm so used to being around certain people, always forget to ask questions when talking to strangers.
Have you actually worked at Google/Meta or a maybe a high-end quant shop? What level, what role? Maybe I'll accept AWS depending on level and role.