ATI practice exams vs. computer TEAS vs. paper/pencil

So after taking practice forms A and B, I'm starting to freak out a little. I've seen a ton of threads where people say they got a better score on the actual exam than they did on the practice, which both seemed to me like they had the most off-the-wall questions on the Science section that weren't covered in any of the study materials I've been using (ATI, McGraw-Hill, Kaplan, even a PCAT guide for good measure). The problem is, I've also seen quite a few saying that the computer version of the test is a good bit harder than the paper/pencil one. Of course, the program I'm applying to administers the computer version, and the average score for the people who even manage to get interviews is around 80. My questions to the people who have taken both the practice tests and the actual TEAS are:

A) How much better out worse did you do on the real TEAS science section?

B) Did you take the online or the paper/pencil

C) Were the questions anywhere near as in-depth (compared to the study guide) as they were on the practice forms?

I've also gone through the entire sticky thread to see what other people have posted about their study methods.

Thanks in advance-I know some of these questions are covered elsewhere, but the possible discrepancy between test versions has me seriously worried.