Usually the wash rate at regionals for people with zero 121 experience has been about 10%. But historically most of those pilots had 1000-2000 hours in GA and/or 135, so it's not surprising to see a high rate among low-time pilots.

If the interview process is thorough and includes a sim that number would be lower. A "pulse check" interview would result in a somewhat higher wash rate.

But 70%...that's either a coincidence that the entire class sucked, or a poor training program.