If only they put such time and effort into studying.....
Some test sponsors allow candidates to bring their own calculators, and also we too, but only if candidates respect the calculator policy about calculators options (no scientific calculators). When those candidates check-in, the Telegraph suggests to us the next- "to turn the calculators over and hold them under a strong light" just to be sure candidates have not written notes on the back in pencil.
don't spend your money on such piece of crap
And finally, from the Student Money Saver, we have the "book on a ring". Out of curiosity, we at M7 type "tiny book on a ring jewelry" in Google images, and found tiny books on key rings, earrings, necklaces.
Given how easily these books are to keep hidden, candidates may not even bother with jewelry and could easily hide them in pockets, sleeves or pant cuffs.
At M7 Test Center, we are focusing our efforts in increasing test site security and protecting exam content. So, don't be surprised when we require to check your pants cuffs, shirt sleeves and ask you to turn your pockets inside out.