Sounds a bit like my school, we had 18% of the class fail and have to resit first year and then about 8~ had to repeat the year entirely. In first year we have 4 exams - each one is 50% of your mark and that equates to 2 public health exams and 2 clinical science exams we call them oh and throw in an OSCE. After 1st year you only have one exam each year and it's 100% of your grade along with more OSCEs. Usually first decile is someone scoring<75%, the exams are extremely ambiguous we have no idea if we're actually learning the right things and they do this on purpose, they think if we're getting 90's then we'll get too cocky and think we know it all. We have a 3 strike system with resits; throughout the whole degree your allowed 3 resits and yes people use them all up just on first year. We have about a 20% lee-way between passing the exam and first decile, ~52% may be the pass mark then like I said above 75 may be the highest mark, also if you get 2 SD below the pass mark you have to repeat the year and there's no chance for a resit.
Each year we're given a list of 400 diseases/condition and they're ranked in terms of what our expected level of knowledge on the disease/condition should be and that's all we get told and let me tell you nobody has a clue what they're doing, our lectures (which we have about 30 for the whole year) even now in my 3rd year are poorer quality than my first year lectures yet we're expected to manage everything as if we were a first year resident and how to handle emergencies and i'm not just talking below 8 intubate.
It sure as hell makes it fun when exam season comes around. Pretty interesting to see how other med schools operate.
Where I grew up you need about a 96% average to get into med school, as in about 2 questions wrong per paper/subject across 8 subjects for that year, this is of course without affirmative action, e.g my cousin didn't get in with a 96% while 65% is needed to meet the cut-off if you come from a background they recognize as needed in Medicine.