Is it possible to complete 12 Sophia courses with min 97% per course in 3 months?

[allvia]

No, definitely not. CLEP "wins" with DSST slightly behind, as far as acceptance goes, but SDC, SL, Saylor, and Sophia are all on approximately equal footing.

I'd add AP in addition to CLEP (and DSST) only because they are the most commonly known alternative (ACE) credits. AP options being offered in most US high schools, followed by CLEP prep, and DSST is most common in US military circles. This leaves them being the most broadly accepted US alternative credits able to be applied as undergraduate course completion. None would be considered more respected over another, it is a matter of being most recognized. As we know here, they are far from the only alternative credit options.