I agree that its pass fail, but I thought I read that higher acievement levels can raise your overall candidate quotient (I forget the appropriate acronym). Am I possibly confusing this with Navy?
it actually takes a lot to fail. you really have to NOT want to be there to fail. if you actually try you are 100% guaranteed to pass (considering you dont get a medical turn-back)
You have to fail multiple weeks of training, which is pretty challenging to fail if you actually try. Those who fail BCT are generally those who decide to quit.