the only mistake in my bio exam was my invigilator
i felt like it was illegal to even look at the clock because the guy was standing under the clock and i felt like i was cheating but i wasn't so i had to act more normal.
(Its like when u go to a shop, except u don't buy anything and u walk out through the way other ppl are walking out after purchasing something and u have to act like u didn't steal anything even tho u actually didn't)