I used the royal flush and I found the 4500 cube counting, 2500 angle ranking, and 2500 hole punching to be very useful. Those questions were a lot harder than any other questions I ever encountered and was really what helped me go from scoring 19-20 to 22-24. I actually got a 24 on the real DAT, but it depends really on which areas of the PAT you are weakest in. I had the most trouble with angle rankings and this is what really helped me out. I just kept practicing over and over until I got better at it.