This is a great app for preparing for the FAA Private Pilot Knowledge Test. Its very convenient to use and nicely arranged.
I studied this in "chunks" and was well prepared for the test. I scored a 98% so I found this to be helpful and good value.
One tip is to buy the hard copy testing supplement, available with test prep books from various pilot stores. It is exactly what you will be given for the actual test and allows you to practice plotting courses, measuring distance etc. Its easier to use than the digital images on the app or on the computer screen during the actual test. A tip is you cannot mark on the supplement during the test. You will be given a transparency to lay on top and an erasable marker for the plots so it is good to practice in that manner.
JA Student Pilot about Private Pilot Test Prep