I was accepted to this School but I was told basic science failing rate is HUGE

I didn't take MCAT so I was considering St. James but after a visit to the Campus a few weeks ago I was surprised to know that some professors aren't afraid of failing half of the class. How is that possible? I never heard of such a huge failing rate . I believe if more than 10% of the class fails something is terribly wrong with the instructor.
Most of the Schools use the Bell curve - whats wrong with St james grading system????:?