<p>"For example, I know someone who go into Harvard and is doing extremely bad. However, in HS she was the all-star student and never procrastinated, very smart and took the initiative. . .what happens with these really bright students who end up at the bottom of their class or flunk out?"</p>
<p>Something like 97% of Harvard students graduate from Harvard. Most of the rest graduate from other colleges. For instance, when I was at Harvard, I knew 3 people who transferred, one to Stanford (She was a California girl who missed her home state), one to GWU (She had a fiancee there).</p>
<p>Statistically half of the class will graduate in the bottom of the class. :) Graduating at the very bottom of one's class from a top school certainly isn't the kiss of death. (Heck, McCain graduated at the bottom of his class at Annapolis, and look at what he has accomplished!). Students from the bottom of Harvard's class can go on to illustrious careers in a variety of fields.</p>
<p>It's very hard to be kicked out for good from Harvard and similar schools. That's because the colleges selected students with excellent high school track records, and the colleges tend to stand by their students, viewing any problems as temporary aberrations. </p>
<p>One guy whom I knew flunked all courses his freshman year due to involvement in protest activities and partying, and was told to take a year off. I'm not sure if he ended up graduating from Harvard, but I do know that he's now a successful lawyer. </p>
<p>Anyway, students can go to top colleges and have mediocre grades due to partying, mental health problems, relationship problems, overinvolvement in ECs, or downright stupid mistakes. In general, though, the students who go to the top colleges graduate from those colleges, which tend to have the highest graduation rates in the country.</p>
<p>And even students whose grades were mediocre at places like Harvard can get into graduate and professional schools. I only knew one med school aspirant who didn't get into medical school, and she truly had dreadful grades due to partying. Typically, at Harvard, the question for aspiring lawyers and doctors was which professional school they'd gain entrance to, not whether they'd get accepted anywhere.</p>