I disagree with everyone who says read the passages like you're interested in them...I think that if you do that you'll be thinking too much and may draw you're own conclusions about the topic - which is bad, since you're only interested in what the author thinks.
I took Kaplan and wasn't a big fan of a lot of their techniques, but I do think their VR strategies were on - read so you know where the info you'll need is, don't worry about digesting it. When you read the questions, you'll be able to refer back to exactly where that info is. Also remember that you shouldn't add any outside knowledge, everything you need to answer the question is in the passage...
On the actual MCAT I felt very confident after that section and I ended up doing better than any of my practices.