IMO based on passing the boards there is no magic app or tutorial (based on experience), those are just guidelines, meaning u will have to dig a bit deeper most of the time to make sense of certain info. This applies to all of them there is no 100% course that will give u everything. Understanding this you got to check how u like to approach ur studies more, do u like reading or do u like apps answering questions or u like a tutor like system, or u want a combo of everything. I can tell u I used BnB dental for the boards when it was part 1 and 2, with Mosby and YouTube vids. As for mock questions just get the Dental Mastery App