Getting a bad mark on a test is pretty bad, but it's much worse when you knew the answer but made stupid mistakes, amirite?

I'd say the worst is when you get it right the first time, then when checking you start doubting yourself and replace the answers with the wrong ones.

God, that pisses me off soo much! Especially if I end up getting like a 70 cause I was having an off day... Seriously sucks.