Unfortunately, I agree with you that a substantial percentage of fourth grade level people would have the opinion you state and thus be taken in by Trump more than people with a higher grade level (some of which are taken in anyway - others are racist - others think Trump is an idiot, but still in their economic self-interest).
What is the obvious conclusion? Bernie was right to push for free public college tuition. A more educated public irregardless of whether that education directly applies to a career is a good thing for US democracy. I’ve long thought I want my car mechanic and everybody else to have a college education. Free tuition won’t get us all the way there immediately, but it would help.
In general, I’m against means-testing for benefits - I say make the tuition free for everybody and richer people still get a benefit (but pay more for it obviously).