My university exams either didn’t allow a cheat sheet, or they were open book (meaning take in whatever books you want).
Generally I ended up creating something like a cheat sheet for every exam any, which was usually a side or so of A4, but written at a normal size. I’d use this to do last minute revision, but mostly because I’d realised that making it was the best way of checking what had gone into my brain, and what hadn’t.
It wouldn’t include anything that I could remember (so no F=ma or KE=1/2mv^2 etc.), because why bother writing down something I already knew? They were just ma distillation of the bits of the subject which weren’t sticking well.
I couldn’t take these into the exams, but I’d skim over them just before the exam, and as soon as I got into the exam I’d copy down any formulas etc. before they fell out of my short term memory.
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