At many Ivy league schools, prereqs serve mostly to tell the students what they should know before taking the class, not as deterrents to actually trying. Ofte

At many Ivy league schools, prereqs serve mostly to tell the students what they should know before taking the class, not as deterrents to actually trying. Often the professors will waive the requirements after a brief interview. I've seen plenty of 18 year olds in graduate classes, and I've seen highly talented students simply read the books for the prerequisite math classes and do quite well.