As stated, any number of question can result in a pass. That being said, the statistics of a maximum question allotment attempt are the inverse of a minimum question allotment attempt.
There are two parts to NREMT success. Knowledge and adaptive test taking ability. If you're sure you have the knowledge, then you're deficient in your ability to take adaptive tests. If this is the only adaptive test you can't pass, then you don't know the material.
It really is that simple. Are you studying by re reading your textbook over and over again, or are you using one of the many adaptive test prep programs available? If all you're doing is reading the text, then I'd bet your problem is test taking ability.
There are no hidden secrets, no code words, so secret handshakes. The tips for NR success are well documented on this board(hint: they all boil down to online adaptive test prep).