It's okay if it's just like a review or study before the exam but, if doing this on the actual time of exam day, that's cheating.
I never told nobody needs to learn, we help people, who struggle the exam. Going to an exam without learning is not a smart idea..
We know what answers they will get and what trick questions there is. And that's the way we help the candidate.
And in your case, as you've said that it's a 100% that someone will pass, this isn't the type of service that they should avail. It's a leak, it'll make them dependent on it and could take the certification and go out in the real world incompetent.