I don’t know how it is now, but when I took the exam at school (2008), we had the formulas in the public domain. Because there are just an unimaginable number of them. A straight answer to the question was considered a cheat sheet.
I have a tattoo on the back of my right arm with the Schrödinger equation. There were a lot of jokes about the cheat sheet, but when you see your tattoos every day and explain to people what they mean (sometimes I tell people for 2 hours about quantum mech), willy-nilly you remember them)) I have a lot of plans for this occasion, one sleeve to do with physics, the second - with higher mathematics
You can write the answers to the test on a very small piece of paper and put it under the clock, then quietly get it out and put it away somewhere) or download the answers on the digital clock itself (if any) in the form of a photograph. Criticize)
Shpargalka (zarg.spur) is an information carrier used in exams, tests, exams and other tests of knowledge in order to spy on or write off what the subject had to remember.
How do you understand the entry on skin also falls under this definition, and if during the exam you find out that you are copying from the "tattoo", then you will fail the exam as if you were drawing on your nails. If the tattoo is seen before the exam, it depends on the quick wit of the examiner - he can stick a plaster / scotch tape, or just put it in front of him
I took exams in geography and mathematics at the institute using nails. I grew long nails, there were 90s in the yard, so you could get approximate tickets. On the nails, finely-finely, under a magnifying glass, with a pencil, answers were written or examples of solving equations. Everything was painted over with varnish with dim transparent sparkles. It helped perfect.
Another option is also trouble-free - to write all the narrow points that can be found in the exam with the thinnest pencil, subtly, barely noticeable, on an A4 sheet. Put it in your belt or bosom. On any exam, they give A4 paper for drafts, you quietly pull out your sheet, from the side it looks clean, put it in front of you and copy.
But nails are more convenient.