That should come under citizenship. So in that sense yes a test must be sat for citizenship then free to vote.

Some people may need education on voting and constituents however restricting their access or taking that right away from said persons is kind of the same as the left hand not wanting to be on the same body as the right hand.

This would create a secular devide and education stricken areas would be left picking up the pieces.

All this because the deep South voted Trump in and the educated people blame the uneducated people for democracy.