Stupidest mistake you've made on a test / exam lately

What's the stupidest mistake you've made on a test or exam lately?

I solved for the roots of a nasty math function but didn't simplify my answer on the very last step and lost all the points for it.

i got clockwise and anti-clockwise wrong
sigh.

Most idiotic mistake i've ever made was stopping at a repeater light on my driving test LMFAOOOOO

I'm not ******ed I swear, just the repeater light was in a ****** up place.

forgot that the balance of payments was to do with imports and exports, not internal aggregate demand :(

I forgot that ideomotor apraxia is only caused by damage to the left inferior parietal lobe and wrote an essay on how it is caused by damage to the inferior parietal lobe :'(

Got all my Biology facts wrong and wrote a freakin long essay about something else that don't even make sense! That's stupid but I'm trying to improve my Biology! ... That wasn't the stupidest mistake ever. The stupidest ones are I spelt 'surprise' wrongly as 'suprise' and I forgot how to round off numbers. I mean those were like really basic but I forgot it! Urgh :(

My mistake would be on my Health and Social Care exam paper I didn't write long answers for questions with 7 answerlines, instead I wrote 2 lines worth. In future I need to stop being lazy and rack my brains for the answers because I do actually know them... :/

I spelt my name wrong!

And I have the EASIEST surname ever (its only 3 letters lol)

Well mine wasn't recent as such, but nevertheless I shall share with you.

My mistake was thinking that exams didn't matter, so I spent most of my exam life annoying the invigilator :) Such as dropping my pencil and having them pick it up, and requesting them to read out a sentence for me because I was "incapable of reading it"

This was me putting it as a joke then an accidental mistake. But a couple of years back i took my GCSE music, i knew i was going to fail along with my class as for about 3/4 of the year we had no teacher so when a question popped up which asked:
Whats the diffrence between a Quaver and a Semi Quaver i couldn't resist not to put that one is a Crisp and the other is a Half eaten Crisp... I felt so smug and even smugger that when i got the exam back i didnt actually fail haha XD