Why? Because it all depends on how you define good colleges.
And that’s the problem. How do you know what makes a college “good?” Are good colleges the ones where the good students go? After all, the colleges that admit only a small percentage of students with high GPAs and college test scores are the ones that show up at the top of the college rankings. But does that mean the school is good because it admits good students or do good students go there because it is a good college?