UCLA and NYU?

So I have this dream to become and actress and I’ve been doing a little bit of comparing these two schools. The locations and tuition of these schools aren’t a problem to me yet as I just want to know some answers to these questions:
1.) I’m going to become a sophomore soon and I plan to take drama in junior and senior year. I haven’t took it for my freshman year or chose it for my sophomore year, will these two years of drama even help at all?
2.) Is it harder to get into NYU or UCLA? Acceptance rates? GPA averages (high school and college)? How successful are the graduates from these schools?
3.) How would one go about double majoring?
My slightly more realistic alternative is just go to a UC and become a sociologist if this whole acting thing fails.