Dental mastery app is insufficient on its own. The occlusion questions are also a lot harder on the real exam. Also there were 30-40 repeats from the ASDA practice tests. I’d imagine if you went through the app and ASDA questions you could pass, but you’d be lacking the working/non working movements/ cusp tip locations/special dental anatomy traits/etc — cutting it close. I’d recommend at least watching the YouTube video on 300 things for NBDE.
Heck I think if you just memorized the YouTube video 300 things to know for NBDE + learn occlusion in 5 mins you’d pass. The exam is heavily weighted on the dental anatomy aspect — you could miss about 50% of all other subjects and still pass if you ace the dental anatomy part. I had a classmate who failed twice because he focused on his weak subjects biochem and micro/path. He got 74 both times!!! I told him just to focus on dental anatomy and head neck anatomy = he finally passed.
Just my 2 cents.