When you have an age group 18-25 which is one of the least voting blocks in the country with the most affected when it comes to government policies, involving them looks like the right thing to do and the idea of voter suppression is out of the window as they are genuinely one of the least participating voting age group in the country. This civics test without any racial/gender/cultural/or any other bias/prejudice is a very good way to have informed set of citizens voting and people like Trump would never make it if this happens. I can only see a win for the country in this. If a naturalized citizen from Africa, Latin America, Europe and Asia can pass it, I doubt it will be difficult for natural born Americans to crack it, its about how much you value your vote. The kind of radically new and positive ideas that's different about the guy.
Involving them doesn't mean estranging them by forcing them to jump through additional hoops to qualify to vote, despite already being natural born US citizens. The idea is to get more younger voters, not less because they're being told them have to prove their allegiance by taking a test. This is why Vivek has no clue what he's talking about. Not only would this be farcically unimplementable, its a terrible, cynical idea that is only being put out there as red meat for the MAGA base.