What else should I be doing if I want to be admitted to an Ivy League College?

Don't be discouraged or think that everyone is brilliant. Keep up your GPA, take AP cles, get involved in extracurricular activities, and learn languages or painting only if you're interested in them. You can't do everything well, so focus on your strengths. Bring up your math scores with tutoring -- it's not impossible to actually like math, I discovered.