Can enrolling school students help US colleges improve access?

I went to a catholic school in Pittsburgh that was distinctly working class. However, it had a great location, sandwiched between CMU and U. Pittsburgh. As a courtesy, the universities allowed certain students (including me) to attend specific classes (usually those with spare spaces). It was a great opportunity and made things easier once I went to university. Rather ironically, I did better in the college classes than in my high school classes (which were harder). With AP plus this option, I finished my BSc in three years rather than the usual four.

"Access" yes. Enrollments in college and gross promotion by large public univs yes But learning. Preparation for success. Graduation rates, NO I too completed my BA in 3 years. But it followed a full year's credit for Advanced Placement courses with a national exam (not that that's a guarantee). Today, even jr high school courses count for college in some US states. That failed the students. Note the loud contradictions in the earlier comment: colleges filling empty seats.... It's all in the economic model not the best for students