Citizenship Test

The date is near for my Mom to take the citizenship test. She still goes to classes to practices with several volunteer teachers. My brother and I occasionally call her to do some impromptu tests. She becomes so good with routine questions that her answers are automatic. Even with some random free formed questions, Mom begins to pick up the keyword in these questions and answers them. My prediction is that she has 60% probability to pass, as long as she is not intimidated by the process and interviewer. If she can answer the questions from phone without looking at the questioner, then she should be able to answer them face to face.