My old TI 83 is fine. First time around in college was a TI something in 1977. It’s still working. They never let us use calculators on tests back then
I used a TI-83 in Calc class. Had a great instructor - he WANTED us to use the calculator to make sure we got the right answer, but we had to show HOW we got the answer on the test. I don’t think any of his tests had more than 10 questions, you could fill half the page showing your work for a single question.