Before you add a single college, research Harvard, Stanford and MIT. Learn what they value and look for, see what the students they brag about are up to. (It’ll give you an idea for the others.) You have the common CC idea that your high school accomplishments set you apart. But the tippy tops are looking for more,what makes them want you in the communities, beyond academic strength. You have an excellent start, but thousands will apply with a similar profile.
At this point, imo, no one should tell you how to organize your app. Not until you have some idea of the attributes they look for and which of those you can show you offer. You’ll need to be savvy. That can’t start until you’re more aware.
What have you done outside hs, beyond your stem interests? What, other than pursuing you own “interests?” Beyond what the hs offers or endorses. what do you do for others?
Go look at the MIT admissions blogs.