I passed TOGAF 9 part 1 and 2 today. I prepared only for part 1. I used only $0.99 sample test from Togaf site and Openarch 3 tests online. I prepared for 4 weeks on average 30 minutes a day. I never bought a book or pdf.
I used only this. (http://pubs.opengroup.org/architecture/togaf9-doc/arch/)
Never prepared for part 2. I took part 2 at the same time as it is cheaper.
I used knowledge from part 1 and common sense to pass part 2 at 62%, cutoff was 60%. I got 25/40 for part 1. I barely passed part 2 without any preparation at all.
Part 2 is interesting. By randomly guessing, one's expected value is 60% (the passing score) if you can merely identify the distractor. You can get 0, 1, 3 or 5 points per question. If you can eliminate the 0 points answer, you are likely to (barely pass). Which is what sounds like it happened for you. While this does get a passing score, it doesn't show understanding of Togaf.