I’m a sophomore so maybe too early, but decided to post anyway.
Colleges: CMU, Columbia, Princeton, MIT, and Stanford
For Columbia, I have a cousin (currently at Columbia), an aunt, and two uncles graduate.
Major: Statistics and Machine Learning or similar
Unweighted GPA: 3.87
Weighted GPA: 4.28
Class Rank: 5 of 106
AP scores:
Statistics: 4
Currently taking:
AP Macro
AP Calculus AB
AP Computer Science A
Plan to take:
AP English Lit
AP Micro
one science AP (bio/chem/physics)
AP Government and Politics
AP Environmental Science
may self-study or take AP Comp Sci Principles if my school ever offers it
ACT: 34
Ethnicity: Asian
Extracurricular:
Chorus
Student Council Vice President
Basketball
Volunteer teaching computer science at my local library
National English Honor Society Vice President
National Science Honor Society
Awards:
CTY Grand Ceremony
(yeah, I need to improve this section in the next 2 years)
What do you guys think?
You’re off to a great start! Just a few recommendations…
Your EC’s don’t align with your interest in machine learning and statistics. Although it’s great you already have two leadership positions, make sure to demonstrate interest in computer science / statistics / machine. Make sure to develop projects in these areas, such as games, mobile apps, and web applications (two specialties of mine). Since you are interested in machine learning, create a project with Python and Tensorflow to create a neural network to train data from free online data sets (Elite Data Science has a great list). Doing this shows passion, and more importantly, that you are high achieving outside of school.
Also create a club dedicated to app development or computer science to spread your interest in computer science with others. I can’t recommend it enough. It’s led me to some great projects.
Lastly, remember to be very active on GitHub. 
Good Luck!
You do not mention Essay which I think is pretty important too. at least some of the school you listed require it.