For CARS, although this may seem counterintuitive, just do the opposite of what you're doing now. Not only are the passages about 25% longer on the real deal, but the passages are dense and the questions are not straight forward at all. In this situation, testers see they are running out of time, panic and choose the answer that makes the most sense. 85% of the time, the answer that sounds good to your gut is exactly what they wanted you to pick and wrong. Think about it this way: the AAMC wants to weed out anyone who doesn't have ridiculously heightened critical reasoning skills. This isn't an SAT test of "here is the info, now what answers the question?" The people who score 132s, form what I've seen, have all learned this "trick" of choosing the ambiguous--technically not wrong answer--that they have NO idea why it is the answer. If it is ambiguous and not technically wrong, this is the answer. Even the answer you feel is 100% correct is wrong. It's the ambiguous one.
The trick for me is to take my own advice. I'm still stuck w/ my old ways, but once I remember "yep, this answer is ambiguous and I see a condescending CARS exam writer putting this here", I choose it. And low and behold, it's the right answer.
I hate CARS w/ a passion.