Earlier quoted context omitted.
Luck only gets you into MIT after you pass the cut of it deciding you can do the work, most especially a term of the calculus past the AP BC sequence, and calculus based mechanics and E&M. When I last had figures (since then I gather applications have increased), about 13,000 applied, and about 3,000 were judged to be able to do the work, from which MIT had to extend enough offers to get a class of ~1100. MIT does a…
> as a rule students who choose an appropriate major make As and Bs, unless they're having personal problems. This is grade inflation, not a badge of pride to MIT.
What's happening is that MIT very carefully matches its student body to the demands it places on them, something that's worked out well since the post-Sputnik reforms in K-12 science and math education (for more historical perspective, when it started, post-Civil War, a large fraction of students would only be mastering the calculus at the end). There's many levels of oversight including the "outsiders" in Visiting Committees, feedback in the system, etc.
And MIT really cares about undergraduate education (which I gather is all too rare except at "low end" higher education where the school has no pretenses about doing a lot of serious research; one of my chemistry TA came from such a school). All classes are taught by tenured or tenure track professors, with exceptions that prove the rule such as SF author Joe Haldeman, and professors don't get tenure unless they're adequate at teaching.
I once witnessed the EECS department head make a professor read every student evaluation (i.e. students providing feedback) for a course he'd just taught, all but one of which were negative (and the positive one was a special case), and at the end told him he'd never again be allowed to teach that particular course. Etc. etc.
ADDED: MIT tries very hard to be a meritocracy, and since it's focus is on "you can't fool Mother Nature" engineering and science, that's practical.
Semi-disclaimer: I have a lot of ties and history with the EECS department, but being an EECS major is not one of them, I was science track.