10 crazy and inventive ways students have cheated in exams

Writing notes on the back of a calculator in pencil
Writing notes on fingernails
Hollowing out pens to hide secret notes
Using ultra-violet pens and invisible ink
Calculators with memory functions are used to hide test answers and formulas
Writing notes on the inside cover of a water bottle label and sticking it back on
Smart watches which look like digital watches have been used
Students ask for their papers to be returned after marking and make it look like teachers have made a mistake
Drawing answers on an eraser, which is then flipped over
And this crazy story from a medical school in India:
Bala Senthil Kumar wrote: "All this would pale in comparison to what I have seen, and to this day, remains a mockery of all other examination cheating I have ever seen. This was at a medical college in India. (No, I won't tell you which one!) One of the students throws his question paper out through the window.

"Someone else who isn't taking the exam waits at ground level, picks it up and leaves. On the street just outside the college/class a van with a public address system waits. The question paper is delivered to it, inside which all the crooks are seated with books, notes, guides, whatever it takes - who start dictating answers via broadcast! Everyone passes!"