They don’t have hard quotas of course since those are illegal, but they definitely have soft ones. For the OP, Naviance is the best bet to see how the high school does wrt Stanford. If 100 kids apply every year say and 5 get in, it’s not going to 10 anytime soon, may not go to 1, it will be around 5. That’s what the GCs tell the kids, maybe that’s why the OP has the question.