I think this image says it all.
The most important one to me is the second graph, showing the histogram of grades. It's pathetic.
However, I'm not going to jump and blame colleges straight away. As the infographic notes, "60% of college presidents say public high school students are less well-prepared... than they were 10 years ago." If that's the case, they're merely being forced to pass along students that have already been passed along. As a high school teacher, I've already noticed the same thing; students walk into high school barely being competent in basic arithmetic. Primary schooling is shuffling students along.
Why? Our educational policies punish schools that don't. This needs to be fixed.