If those are your scores for CDP timed then you are in great shape! I'd recommend Achiever though, since the Keyholes on Achiever are must more representative of the real thing as opposed to CDP, which are actually much easier and don't require familiarity with proportions. But cube counting is much harder on CDP along with angle ranking. Also, pattern folding is on the easier side for CDP as well, Achiever is MUCH harder and will prepare you well for the real thing.
As for those who have troubel scoring above 15 or 16, I remember I scored a 15 on my very first one, untimed. You can imagine how frustrating that was. Anyways, I didn't let the scores get to me and just used the first 3 tests as my introduction to how to do PAT, and then once I got the basic technique for each section down, I started to cut down the time. I went from 120 min to 90, then to 80, and 70, and finally 60. My scores remained constant at 21 for all those tests, even with the shortening of the time. The remaining tests I did at 60 min and usually got a 22 or a 21. For me, the hardest thing to learn was TFE, but with enough practice, it will finally click and you will be able to answer those problems with minimal time. There's no way to really rush through PAT, it takes time and patience, but can have a good payoff if you put the work into it.
