okay, it's kind of expensive, but it worked pretty well for me, and I passed the first time (ARE 4.0, Struct. Systems). I was only getting about 70% right on these practice quetsions, btw- so I would say they are hard enough. They are more math-intensive than the actual exam, I would say.
has to be used with this book: http://www.amazon.com/Review-Manual-Architect-Registration-Exam/dp/1591261201
I told myself I would just by the SS Sample Problems, then wing it after that, but once I took the exam I changed my mind. I'll probably buy most of these. The exams are tough and these problems help find your weaknesses.