If I had to pick just one, Thor. I wish I had went that route sooner. I found that each and every medium I used had a little different spin. Everyone has their experience and knowledge to share but no one particular source was spot on exact. By NDA I’m sure they can’t be, and the exam is so broad you have to ensure you have an understanding of every domain. Everyone gets a different exam too. All total I feel they all collectively gave the full picture. Just like reading every post here from test takers. No one can, or should, give exam info but put enough experiences together and read between the lines and you get a great perspective of what to expect. Sorry rambled a bit. Thor.