I've been getting through them really fast, too. I have been having 15+ minutes to spare. Like you I am afraid to go back & analyze too much because I am notorious for changing a right answer to a wrong one. My strategy for the test, I think, will be to go through reading the questions thoroughly, and marking the answers I am at least 75% sure of. For the questions I do not have an immediate response to, I am going to just take my best guess and mark it (not spending more than 1 minute on those), and then at the end with all my extra time I am going to go through those and really try to figure them out. That way I'll at least have the "easy" ones answered right and I should have time to rationalize those that require lots of thought. Anyway, that's my plan. What are you going to do?
It's going to be so hard for me not to change answers, so I am just going to limit myself to looking twice at those I am really not sure about (the marked ones)