I found a couple errors in the questions.One data sufficiency question asked about congruent triangles, giving you the area of the large triangle. Both the stems were each of the lengths of the same side of the triangle, one being larger than the other.Oddly enough, you cannot find another side to the smaller triangle (or the large one, for that matter) because they did not state that it was a right triangle. Had they stated that, the question would have been right. Instead, it was wrong.There were several questions like this. Sometimes a question would pop up more than once depending on how the software felt. I don't even trust it to tell me the right answer to the rest of the test I took.What a waste.