That is so clever and enterprising. Though it does seem like a lot of work, and you still risk being caught.

My cheating method was foolproof and completely undetectable. See, in the days leading up to the exam, I would look up the answers in the textbook the teacher foolishly provided us at the beginning of the semester. If the answers weren’t there, they’d be in the secret notes I had taken while the teacher was yapping in class days before, clueless they were basically telling us everything that would be on the exam later lol. All I had to do was read those notes the night before, then I could walk in empty-handed and take the exam with no one the wiser that I already knew all the answers!

I bet after those high-effort cheat sheets you memorized the materials anyway haha.

I used to put notes into my TI-83. It was hard enough to convert the formulas into a calculator-friendly format that I usually memorized it and didn’t need to check them any more.

At some point in my life I want to write a long article about how I optimised every aspect of making a cheat sheet

Can you LaTeX it?

Too obvious. That's black on white. Like every print. A teacher would spot that from the other end of the classroom. And decals? That just limits Your usable space. How much text can You fit that way? And how many "fancy pencils" did You have? Fancy things don't come a dime a dozen.