DO NOT PURCHASE THE BMTCN PRACTICE TEST!
I purchased the BMTCN practice tests on Exam Edge. Over the span of few months, I took all 5 test with all three attempts. When I took the first test I did fairly poor by getting 50s or close to that score on each test. But after studying I was progressively getting better, going from 50s to 80s on the second attempts for each test. Then for the third attempts I got 90-100% for each of the five tests. So after more studying I thought I was more confident to take the actual test. But when I took the actual test, barely any of the material in the practice tests were present, and I ended up failing.