California had a great mechanism for this in their land grant colleges, which back before the protests of the Vietnam War were required to offer the valedictorian of nearby high schools (or the person with the highest GPA who accepted) full tuition and room and board --- then Governor Ronald Reagan shut down this program when the students had the temerity to protest the Vietnam War --- it was also grade inflation to keep students above the threshold necessary for a draft deferment which began the downward spiral of American education.