I think quadrupling the work load of a student is only going to pan out with extremely talented individuals. This sounds entirely too unrealistic to be practical advice.
It will require a few things. For starters, from the first semester the student will need to know what degrees they are aiming for and plan accordingly with their advisers. It will require sacrificing some of the fun of college for a more practical approach. It will require giving up any hope of having no classes on a Friday. That's not about being talented though, but about discipline.
If the student will be taking out possible $100,000 or more and they can't do this, then they need to evaluate what they are about to do. Are they about to risk life long debt for an education or for a college experience? If they don't know if what they are studying is what they want to do, should they really be paying someone to teach them how to do it?
Also, if following their passion is something that is extremely difficult for them to learn, then perhaps college is not the right path for them to follow that passion. There has to be some realism on focusing on what you are good at.
This is all much easier when high schools adequately prepare people for college. I wonder how much of the increasing problems at the college level are a result of high schools providing educations of lowering adequacy.