Carelessness overload

Oil and Gas common test this afternoon. Kind of screwed it up. Did not realize the mistakes I made and handed up the paper knowing some calculations that are not shown marks will be deducted. And I miss out a two marks question that may save my ass! Damn! Literally face palm. First time missed out an exam question.
And studied after exam. And studied when I reached home. I do hope I won't be careless tomorrow.