This is all wrong.
If you don't know the answer under timed conditions than for all practical purposes you don't know the answer at all. If you want a realistic idea of where you would stand during the real test, set the timer to recreate the real test (i.e. 1.33 min/question). MCAT questions are designed to be solved very quickly. If you spend more than 3 minutes on a question than you're pretty much ****ed. Mark, guess and move on. You'll be surprised at how obvious the answer can be on your second pass! The most important thing is to keep moving. The MCAT requires dynamic multi-angled thinking. Honestly, it reminds me of snowmobile watercrossing. Keep the throttle open otherwise you sink!
http://www.youtube.com/watch?v=HuMdHJN0XQo
http://www.youtube.com/watch?feature=endscreen&NR=1&v=FrxDWcqIH4o
But if you want to feel good about yourself and shield yourself from reality, than by all means take all the time in the world. Drop trou and jerk off between questions while you're at it! Why the hell not? Yeeeehaww!!!
Just remember that on test day there are no excuses. So I surmise that the best way to study is without any excuses.