And how has that worked out for you?
India must graduate around 20,000,000 students per year. The top 1% is therefore a cohort of 200,000 students. MIT typically enrolls about 5 students per year from India. The top 1% doesn’t cut it. Nor does the top 0.1%. Nor the top 0.01%. You need to be in the top 0.001% before you start to get competitive.
Had you aimed at something realistic instead of the sky, you might be in a US institution today. Just to pick two, Iowa State and Texas at Arlington have good physics programs, and give out better international financial aid than most.
I would also caution you against picking a graduate school based on perceived prestige. The best school in experimental nuclear physics is not Harvard. It’s either Stony Brook or Michigan State.