For what it is worth, I did this multiple choice exam many years ago and was given one piece of advice which stood in my favour.
Before attempting any question, read all of the paper and mark on the paper what you think your answer might be. Then go back and formally answer the questions.
Forget what others are doing around you, you will have loads of time. You will often get clarity on a question at the begining of a paper by seeing a similar one at the end.
Good luck