As prirun says, you have a conversation, not a quiz.
Quizzes are a terrible way to assess skill; they're used in academics because they're, sadly, the only quick way to get some sort of consistent feeling over the memory and information retention in a group of dozens of students. No intelligent company should be copying this; companies have the luxury of dedicating significant time to exploring the potential of each candidate.
You say "Hey, here's a real problem that we'd need to solve. How would you go about it?" And let them talk. They'll be able to speak in informed terms about how to approach the problem even if their algorithms memory is rusty or if they're self-taught. If it sounds like they're on the right track, you win, if not, you move on. Repeat until end of interview, evaluate at the end.
I've used a basic code competency test for an interview pre-screen before. This is a take-home project that should take a competent person about 30 minutes, 2 hours if they go all out and add a bunch of bells and whistles.
People say this, that their take-homes are non-intrusive, but don't mean it. I mean it. The quiz is seeing if they can make a single API call to a prominent API and return the results according to a very simple format.
These pre-screens should be well below the competency requirement, which can only be assessed in the interview. It's essentially a fizzbuzz that they can't easily copy and paste by searching for "solutions to fizzbuzz".
Other than an extremely simple pre-screen like that, your decision should be based on their ability to reason, discuss, and solve problems on the fly, not how well they remember the particulars of compsci curriculum. That selects for the recency of their last class, which, ironically, is usually inversely correlated with their much more valuable real-world experience and what people think they're trying to test for.
This doesn't apply if you actually are doing deeply theoretical work on the cutting edge of compsci that may require frequent cooperation with academics. But that's a tiny minority of positions.