I love CDP! When I first saw the PAT questions, it might as well have been in another language. But I bought CDP, read the directions to each section, and went through and learned how to do the questions. You'll be able to come up with strategies of how to figure out the answer on your own...the difficult part is finishing in time. That will come with practice. I firmly believe CDP is all you need for PAT.
Good luck!
PS. Don't worry, PAT angles are easier on the real thing. But practicing with CDP will help you to learn to differentiate really close angles.