Many schools are labeled "football factories," meaning their academics aren't as demanding as some other schools, admission to their university isn't overly daunting, and they really care more about football than education. Those schools (and I am not going to name them) don't have as many restrictions when it comes to choosing and pursuing recruits.
On the opposite end of the spectrum are the schools with special standards. Whether it's a football program for one of our military academies or a school with exceptional academic requirements, there are several programs in college football with a limited pool of recruits from whom they can choose.
This slideshow takes a look at some programs on the college football recruiting landscape that recruit with a different set of standards than those "football factories."