Failed TOGAF 10 Part 2 Exam!

I took the TOGAF 10 Part 2 exam and got 57%. The passing rate is 60%. When I walked out of the exam, I was quite confident but the result was the opposite.

Now that I need to re-take the exam, I need some advice on how to prepare. I did read the TOGAF 10 Conformance Requirements on Part 2 before. I marked all the sections in the various guides and read them multiple times. I also did the practice test multiple times. I noticed the questions in the exam are similar although the given answers are quite different.

I noticed that one of the questions in my failed exam had mentioned architecture definition iteration in one of the answers. I did a search and found that archtecture defintion iteration was mentioned in the TOGAF 9 spec but not in the TOGAF 10 spec, at least not clearly spelled out. I don't want to study both the TOGAF 9 and 10 specs if possible.

I appreciate any advice.