I am from a nonaccreditted dental school outside US and wanna take NBDE1. I just looked at some sample tests a few days ago and found that the knowledge it refered was so broad. I nearly fogot what I learned in the first 2 years in my country. I heard that from 2010 the one who has passed the exam cannot retake, unless you can provide accepted reason. Is that true? What shall we do if we are not satisfied with our score?