That's something I experienced as well. In the end, I remember going through my first section and thinking "omg, I was panicking over this?"
I definitely kept thinking the real thing would be way harder than the practice exams when in fact it was quite the opposite way around.
I do think my confidence is what is going to mess me up. I'm going to try and relax! Btw, if i'm getting around 65% on the section bank, is that rather low? I know the section bank is the hardest of the hard. I got 80% for psych though. But not so well for C/P and B/B