For the difficult degrees in subjects like medicine and engineering, a credible central testing site would have to be a requirement. For other subjects, a simple test would suffice.
Women's studies: Men are bad. Answer - True. Ok you pass.
Ethnic studies: White people are racist. Answer - True. Ok - you pass.
History:
1. People of color are peaceful and loving and never oppressed anyone. Answer - True.
2. White men have always oppressed the entire world. Answer - True. Ok - you pass.
When I was doing re-engineering we learned that you don’t hold up 90% of the process for 10%. So few overall students/courses would require in person, you could easily reconfigure most 2 year undergrad courses for free. Centralized skills testing already exists for state level exams for paramedics and nurses, as well as other listening. The technology exists.
I think if I win powerball I will start this.