Our society places responsibility on educational institutions and students to demonstrate competencies and learning outcomes. However, we still end up with a President who lacks basic knowledge of the Constitution, how government works, and basic history.
A proposed Constitutional Amendment

Any President of the U.S. should be required to demonstrate basic knowledge via the Citizenship Test, AP Government, History, and Geography exams.
NASPAA Universal Required Competencies https://accreditation.naspaa.org/standard-5/

Middle States https://www.msche.org/

SACS http://www.sacs.org/

Common Core http://www.corestandards.org/

Citizenship Test https://my.uscis.gov/prep/test/civics

AP Government Test

https://apstudent.collegeboard.org/apcourse/ap-united-states-government-and-politics
AP History Test

https://secure-media.collegeboard.org/digitalServices/pdf/ap/ap-us-history-practice-exam.pdf