Not really sure where your source is from, but according to the
LECOM website: NBDE Part 1 has had at least a 96% pass rate since 2016. It has been higher (98-99%) in recent years. For a class of 105, that's roughly 1-4 people that did not pass on their
first attempt.
In fact, LECOM does not approve you to take the NBDE Part 1 until you pass their requirements, which are partially based on your PBL performance.
To put this into perspective, UF states they have a 99.9% pass rate on NBDE1 and Nova doesn't release those stats.
Keep in mind that school's can only prepare you so much for the board exams, everything eventually falls upon you to learn.