Try to picture the things in your head with you can. If you don't know what to just go with your best judgement. And for the love of god don't second guess yourself. I did that all the time when taking test and it turned out the answer that I thought was right the first time was the right answer. Also, do your best. And remember, doing your best doesn't mean working yourself to the point of mental exhaustion. Good luck on your finals! :)