This is not accurate. students that chose to sit for adex from the first class ('16) saw a higher than usual number have to re mediate the manikin portion (endo, crown preps etc.) i believe most failed for undercuts but everyone successfully passed the remediation. After that fiasco sim lab faculty had to become certified adex graders and classes since then have had way tougher grading for practicals. Furthermore they now require students to pass a school administered mock-adex and cannot sit for the actual exam until they pass.
as for the live patient exam (srp, class 2 etc) pass rates were high, something like 44/48 in fl and 47/49 in erie. as far as i know one student failed the live patient exam 3 times so now they have to redo the manikin portion as well as the live patient and pay the entire adex fee
clinic is what you make of it, demonstrate competence to preceptors and specialists and they'll let you do more challenging treatments
say what you will about PBL but clinic at lecom is definitely its saving grace