^ Indeed.
Really focus when you get inside the exam room. I feel that when I come into it, my concentration just increases tenfold and there is absolutely no fatigue. So have a good breakfast and avoid any caffeine.
Read the questions carefully, and for MC, go through each answer. Using the process of elimination, choose the best answer. For longer response questions, answer it specifically. If they ask you to discuss or to compare and contrast, don't go explaining irrelevant matters or assessing the subject. Write your answers with the important content that answers the question.
If you have time, CHECK! Often when I do this, I pick up mistakes that I wouldn't have otherwise noticed if I didn't check until it was too late. Read the questions carefully!
If in doubt or if you have no clue about how to answer a question, skip it and go along to the next one. Timing is important! If there's 10 minutes to go and you still find you can't answer it, make an answer up with some things that are related to the topic. Sometimes bullshit-ing can work