I managed to somehow pass my CPT Exam after only spending the night before doing and redoing as many of the questions on this app as possible (Im ashamed to say that I hadnt done any preparation in advance). The biggest help to me was the fact that you could read a basic description (and it provided the corresponding page in the NASM CPT Textbook if you needed something more in depth) on what the answer was and why. Basically, every time I got a question wrong I could read why I was wrong without having to spend precious time looking it up online or in the textbook (although I did look up a lot of the muscles so I could see their location). Also, there were quite a few questions in the exam that were identical to the ones in this app. Cant recommend it enough.
Gracksies about NASM CPT Test Questions & Answers