honestly the best thing to do is just read from teh first passage and dont jump passages.. I like to get a passage done in under 8 minutes.. like when I'm taking the practice AAMC tests, I like to get the first passage done at 53 minutes, the next at aroudn 45 minutes, etc etc.. If at any point I've been on a passage for longer than 8 minutes, I know that that time must be compensated from another passage. therefore, if i really need to spend time on a question, i'll spend 45 seconds the most and just guses and move on..
seriously, spending 2 minutes on a question really truly painfully hurts you...
Just read all the way through at your own speed (i read at about 160 - 180 words per minute) and answer the questions as best as you can under a minute each... you wil end with about 5 minutes left to spare and you will feel so much better
OH AND ALSO
take a 5 second break before each passage, ESPECIALLY THE FIRST ONE.. this is a classic exam krackers tool and it seriously helps...
take 5 seconds to stretch, loosen up a few bolts in the neck, crack your back, w/e.. just take 5 seconds to give your brain some rest before you attack the next passage...
honestly, those 5 seconds before each passage, esp the first, really relaly really really really helps you focus