Competitive Exams for physics

[D3$P0]

Hey everyone

I have passed 12th and I am searching for exams like Olympiad that I can give so that when I reach out for a college I can fill it out in the resume.
I haven't given olympiads and any other competitive exams due to my negligence... But I dont wish to suffer in the future by my poor decisions. Exams that could help me boost my
impression while applying for a college will be of great help.
PS-
I am scoping for colleges like Stanford (I'm from India though).

I know about SAT and ACT

I will be doing Bsc in physics... specifically theoretical/ astrophysics from India but MSc from foreign college.

Your help will be much obliged.

Thank you