Do I have to list my ethnicity on the common app and for standardized testing? I think it would harm my chances of getting into any top college (I'm Asian).
I'm pretty sure you have to list it, and, yes, unfortunately, if you are an overrepresented minority (true for most top colleges), your chances will be worse. But I wouldn't worry too much about that if I was you, there's nothing you can do about it.
I asked and AO if I had a greater chance of being accepted into a Math program because I was female. I was told that there is no consideration given for race/gender, just looking for the best fits for the school. That may not be true for all schools, but this was a top West Coast school. YMMV.
To keep this community safe and supportive:
I believe so, I filled that part out last year (hee-hee oops) so I don't remember exactly. It shouldn't harm your chances unless maybe your white as schools sometimes need to meet certain minority quotas or want them to boost about their diversity.