A R test for The Da Vinci Code?

I am taking the test and I have some key information but I asked my friend what the hardest question was and he told me the question but i had no idea what he was talking about, he then told me some other questions and i was clueless on these also. I got some key parts to the book but misunderstood and forgot a lot of it and do not have time to re-read the whole thing. can somebody please give me a summary on the book with details. thank you in advance and please no "just do your best to reread what you didn't get" answers because that isn't what i need and you are just going to be wasting my time