One of the best things you can support, whether you agree with Bill Gates, or with OP, is investment in making primary education as good as is absolutely possible. The result is:

1) people are smarter and more mature even if they don't go to college 2) people who do go to college are already ready to do great work

If, like OP, you seriously want people to effectively graduate at age 13 you need to put a lot of work into primary education first. I admit, if like Gates, you just want more competent graduates, then it is probably going to be more nuanced.