Frankly they want everyone who arrives for class to pass.
Reality is you must know how to study and fly a plane well, and have good judgement.
Remember, they are training you to fly alone...
You will not have a person sitting next to you to catch your mistakes in most cases...and they don't want you to die.
Sometimes you cannot guess who might pass or fail...seen experienced guys fail, and newbies do fine.
Know how to study and fly a "six pack" and you will do fine. Be weak in your skills, not know how to study, and you might have issues. Training is not a vacation...some treat it as such, and suddenly find they didn't study enough. REMEMBER, when it is described as "drinking from a fire hose" it is a very good anology. Yes, you do need to have a bit if downtime, but Don't expect to go home on the weekends...seen people do it rather than study.
It almost as much about mental preparedness to fly 135 single pilot as it is skill level...things happen fast at times, and you need to know how to deal with it.