Like the idea of giving students to fit as many notes on a 3x5 card for a test as they can to use during a test, it’s also indirectly studying the material.
Hah, my kid wanted to do that. We didn’t have the glasses (used for Anaglyph 3D) around, but the school let them use a printer to print on the card. You can get a lot on a 3x5 with a laser printer that is still readable.
I was only allowed to do it once, and on a test I could have easily passed with no notes. I was allowed to bring a calculator to a history test once though. Football coaches roped into teaching give zero fucks.