I think that's the point of exam 2, to make it nearly impossible to full mark it. Make sure your spending a MAXIMUM of 30-33 minutes on multi-choice, remember their are questions in multi choice that are designed to confuse and soak up time. As for the extended response try to work quickly, but not to quickly to make lots of silly mistakes. If you get stuck, again move on, even if it is a 3-4 make question (I know its easy to say, but hard to do), work to the end of the exam and pick up those easy 1 or 2 mark questions then come back to the harder questions. You might think this sounds stupid, but I tend to get short sighted and mentally exhausted, so even though your pushed for time, when you start to get frustrated, just stop, look up and stretch, have a drink of water, maybe if your not to pushed for time go to the bathroom, the walk might clear your head. When you come back to the question, reread it slowly and sometimes you will find something you missed before, or something just clicks.
Your in a better position then me at the moment if you know how to do all the questions. Some of the questions, even after looking at the solutions I simply don't get, and i'm hoping to God they don't pop up in the real thing.