To immigrate from India you have to have attained a certain level of education, have money for bribery, or have connections.
If you guys knew how many of India's upper-level educated engineers, doctors and business people come to the US, go back to college that's essentially remedial, and go straight for grad school in a high-paying field, you'd be shocked.
Its common with Chinese, Japanese, Korean, Cuban, Nigerian, and Ghanian immigrants as well.
Plus they push the next generation to be bilingual and keep cultural standards while also conforming and aiming for the top.