... THINK of logic as a universal topic. That is most students ... to mention this is not universal!
Notice I used the ... deductive reasoning. This implies a universal topic and universal concepts at play.
I think that, for some reason, people downplay the psychological aspect of the test. A precipitous drop in one's score can certainly be due to those factors. I wish I had good advice about that, but I don't. Maybe others can chime in.