Absolutely recommend Ninja MCQs. I was able to pass on the first attempt for each exam and I believe Ninja MCQs are the greatest reason why (I also studied with the Wiley books and Ninja Notes and Audio). In terms of difficulty if you can do these and have an understanding of WHY you're getting a question wrong or right you should have a better than solid shot of passing the exam. I only say better than solid because no matter what you're still going to see questions whose material wasn't presented anywhere in your study materials pretty much leaving you with a hail marry attempt.
With that said I would take my numbers below with a grain of salt. I felt more unprepared for this particular exam than any of the others and without a doubt I had to be at least somewhat fortunate not to have been tested (at least heavily) in my weaker areas. I'd also say the computational questions provided in the Ninja MCQ are a bit overkill in terms of difficulty, at least in comparison to what I saw on my specific exam. However, if you can nail these down your confidence should be rock solid going against the ones on the actual exam. Anyway...
BEC
Qs Not Answered Correctly - 370
Qs Not Seen - 38
Total Q Attemps - 1842
Avg. Score - 51%
Avg. Trending Score - 68.50%
Total Time - 61:58
Actual Score - 83
Keep in mind I was actually so lost on some of the the computational questions that at a certain point I just started skipping them with the intention of coming back towards the end of my studying to focus on them. Unfortunately when I got to that point I was, for a lack of a better phrase, "over it" and decided instead to focus on nailing down the equations and formulas to give myself that best chance. Part of this was also having hit a mental wall somewhere towards the end of REG (my exam prior to this one) and having to grind threw BEC.
Another thing I'll say is I highly recommend starting off with FAR first. If I had left FAR or REG as my last exam it definitely would have been harder. When I had finished studying for FAR (my first exam) I was ready to dive right into AUD without hesitation while only giving myself two or three days off I believe. In contrast, by the time I got to BEC I was fighting a mental wall and literally skipping questions because I didn't have mental energy left to deal with breaking down some of these longer, more complicated problems like I had had when studying for FAR. JMO.