Certainly not, though I would say it should be mandatory for civics to be taught in school. At least in the UK, barely anything regarding how the government operates, your rights, which body provides what service, how laws are passed etc is taught unless you actively choose to study politics.
Then we had a referendum on a major part of our legal framework and people are still finding out now what they voted for.
An informed electorate is important but you get there through education and government transparency, not through restricting people's rights.
RE: Should You Have to Pass a Test to Vote?