Why MIT? You will need to answer that question when you apply…and the answer can’t be “because it’s prestigious”.
Get the best grades you can. Get the best standardized test scores that you can. Do great and relevant ECs. Have great essays and letters of reference.
But even with that…understand that 95% or so of applicants get rejected from MIT. And amongst those are some very well qualified candidates.
The best advice I can give you is…sure…aim for the best (and affordable) college you can get into. But drop the prestige thing. It’s very likely that you can study in your area of interest at many, many different colleges. Start opening your mind to options.