My initial class started with 18. 2 were let go due to PRIA/background check issues. 1 withdrew due to personal issues. The 15 who remained all passed with no additional sims, and nobody has left since (with the exception of an ex-military guy who went to Southwest.)
What I’m hearing from current instructors is this:
If you are disciplined, and put in the work, you’ll pass. If you goof off at home during the self-study portion, you won’t.
Hope that helps shed some light on things.