A near impossible literacy test Louisiana used to suppress the black vote

Note: there are questions about this test's authenticity. Per a note on https://www.crmvet.org/info/la-test.htm:

> [NOTE: At one time we also displayed a "brain-twister" type literacy test with questions like "Spell backwards, forwards" that may (or may not) have been used during the summer of 1964 in Tangipahoa Parish (and possibly elsewhere) in Louisiana. We removed it because we could not corroborate its authenticity, and in any case it was not representative of the Louisiana tests in broad use during the 1950s and '60s.]

Each parish in Louisiana implemented their own literacy tests, which means that there wasn't really much uniformity in the process. Another (maybe more typical) test: https://www.crmvet.org/info/la-littest2.pdf

That literacy test seems reasonable. But I do note that this particular one must predate 1942.

One of the questions is "Congress cannot regulate commerce ..." and the answer is within a state. Which I agree with, but SCOTUS does not (Wickard v Filburn, 1942).

It's definitely not reasonable. You shouldn't lose your right to vote because you don't know which office of government pays USPS mail carriers or the term length of US judges. There are lots of likely-disqualifiers mixed in with the gimmes like "Who is the first president?".