Throwaway account. I'm currently working on college applications, and found pretty annoying. I've been getting well over a dozen e-mails a day as well as two or three items of physical mail every day, all on colleges, all for the past three months. I've been getting a lower level of the same thing since early high school when I first took the SAT. I made national merit scholar and did well on the SAT; that's when it really picked up. None of them have really convinced me to apply (except for Vanderbilt; they put their financial aid stuff right up front). However , I did get a few useful ones. Most of them were notifying me about info sessions for the colleges. There's also a box on the SAT where you check whether or not you want this or not, though I don't remember if it's opt-in or opt-out.
Most of what I get is useless (though as national merit results get processed, I've started getting serious scholarship offers). What I don't like is that most of them are just send stuff to drive up application numbers and drive down acceptance rates, because yes, that's a thing (even though it sounds horrible, and every rejection makes a kid feel like garbage). Mail is cheap, I guess, but I wish colleges would relegate their communications to those they actually wanted.