I dont think they will make a "wrong" answer correct based on the response.
Typically the grading on these essays is done with an answer key that gives a certain amount of points for each point on the key. I think that if most people answer in a way that is correct, but not what the examiners initially expected, the key would change and the majority answer is going to score sufficiently.
More to the point, though, Barbri is going to give you certain buzz words to use. They may not necessarily be the words that I would choose, but using them will put you with the pack and will usually track that answer key. That's what I meant by saying that I would rather be with the group than right.