It'll depend a lot on who/where/how is doing the screening and what tools (if any) are permitted.
Remember that bogus program for TI8{3,4} series calculators that would clear the screen and print "MEMORY CLEAR"? If the proctor was just looking for that string and not actually jumping through the hoops to _actually_ clear the memory then it was trivial to keep notes / solvers ... etc on the calculator.
I ended up displaying "M" "e" "min(" "c" "log(" "e" "a" "r" "e" "d". Then covered up the "in(" with spaces.
Then you lower your contrast for the full effect.
In the years since, I’ve only ever heard mention of older models, not newer ones which makes me wonder if this is a special case and situation where technology is frozen in time intentionally to foster learning.
Oh yes, they're frozen in time, but since the people who pay for them are not the same people who demand they must be used, they're not frozen in price. It's the most expensive kilobytes you'll ever buy.
At my high school we were allowed to have TI-83s but not TI-89s, because 89s had built in CAS (computer algebra system) and could do your algebra homework for you. When I went to college I already had an 83 so I didn't feel the need to upgrade.