That's a tough one. I had already bought DS Building Thinking Skills before I had him tested w/ the WISCIV. He finds that type of thing fun. I didn't have him do it before the test though b/c I felt like it was cheating. The Critical Thinking Co even states in his literature that it raises scores on SBV, WISCIV, etc. I understand that is a bit different from using a product which is geared specifically to one test but perhaps not by much?