Personally, I didn't think any of the study resources closely resembled the difficulty of the actual exam, but I felt that the Dental Board Mastery app and the ASDA released tests were the most comfortable for me to use. I was scoring about 65% on the ASDA tests and I passed the real thing first time. I also only studied for just under 2 weeks. I would have liked to have been scoring higher before taking it, but from what I hear, nobody feels too confident coming out regardless of how you felt going in.