A good accompaniment to the official material
Some errors in the questions and not everything from the material was covered in the questions and flashcards so this should be treated as supplementary to the provided material and not a complete study program in and of itself. I found it a good way to motivate myself to study by starting with a quiz. It's expensive but ultimately worth it when you consider what's on the line. I look forward to the increased security that comes with my permanent residency in a few months.