First of all, the OP made it clear that the exams are in-house NOT nbme shelves. I have taken both and was referring to in-house exams set by PhDs.
Secondly, I was just sharing my experience. I should have made that more clear, sorry! I only attend one med school, so it could be different at other schools. Things were that way in undergrad with harder classes (engineering, physics/pchem, etc) but I had thought things were different in med school.
If a school accepted a 50 or even a 64 as passing, that would be news to me. Was your school that way? I'm not saying it's impossible but it seems a little strange. What kind of a school has averages below 70%? (Or what class would that be for?) At that point, either the exams are badly designed or the students are seriously slacking. It would be a real morale-crusher to the whole class, too.
Besides, the OP seemed upset with their results on the first exam (64 was "bombing") ..... so I highly doubt the OP is "golden". Sorry for derailing the thread, I don't know what advice to give other than that if flash cards are not working, maybe it's time to drop them in favor of something else.