For several undergraduate courses, especially the preconditional courses for more advanced courses, there exist CLEP exams. I took a handful of these and got full credit while in the military - at the time they were $99 for each test, and my education command paid for them as a benefit.
There could be a better system here, of course: for example if MIT offered a pay-per-exam for everything they released as open coursework and stood behind the accreditation. It doesn't have to be 1:1 for credits either, as an exam may not be representative of lab work when lab work is present.
There could be a better system here, of course: for example if MIT offered a pay-per-exam for everything they released as open coursework and stood behind the accreditation. It doesn't have to be 1:1 for credits either, as an exam may not be representative of lab work when lab work is present.