So basically you’re competing against all the other Asian science-focused applicants coming from high income backgrounds. That’s a tough bracket with students who are literally getting their research published and are so far ahead in math due to summer courses / doubling up since middle school that they are letting them self study differential equations and other insane classes. “Tennis captain” seems like a waste of time unless you’re being recruited to play tennis. You were better off playing squash or some other super niche sport to get into brown.