If the average IQ of all Indians was 10 points (S&B) lower than the average American (and I'm not implying that it is, I'm just hypothesizing to make a point), if you plot that on a Bell curve, with their 1.4 billion people, that means they still have more geniuses (140 S&B or >) than America does.
But by the same token, it also means they have more idiots.
Talking to an Indian sound engineer (educated in India), I happened to mention Amar Bose, American-born, ethnic Indian, one of the most famous sound engineers ever. He'd never heard of him. Or Rudyard Kipling. He told me their engineering schools only teach science and mathematics. No history, no literature, no PE. Nothing but engineering.
I’m very grateful to have been given a wide education. We were given two years of our major and two years of general humanities. But there were exams on entrance for all the courses and we could get out of up to two years of classes by passing out before we even got in. Mother and father met at U of Chicago in the same building where I had my humanities classes. It was an original source school, so we didn’t have textbooks, just collections of original writers. I still have those collections on my shelves. I also have mother’s books. Those who have been funneled deep into one specialty probably don’t miss the wider discussions that you and I were given. If you don’t know that world, you don’t understand what you haven’t experienced.
India has engineering schools? Are you sure they aren’t little offices handing out pieces of paper?
Most sources list the average IQ in that country is 77~80, or about 20% lower than America’s.
https://worldpopulationreview.com/country-rankings/average-iq-by-country