Well, based on my last two years (since 2016 Q2 to 2017 Q3) of steady sitting for US CPA exams: FAR(4x); AUD(3x); REG(2x) & BEC(2x), the only thing that works is to basically read your book, watched videos, maybe listened to audios and make a really good notes out them. By doing that, it will give you at least, 50-60% of your score from actual exam. You have to bridge this gap by doing a lot of MCQs, and SIMs if you can, especially those that you're not so comfortable.
Make sure you're studying and doing MCQs and SIMs that are similar to the actual exam. AICPA newly released MCQs since 2005, are very similar to what you'll see on your actual exam. The SIMs, not so much out there. The closest SIMs you'll see out there, are the ones posted on AICPA's website. Even that, they were just 50/50% difficulty as to the actual exam.
For example, I took 2017 Q1 and 2017 Q3 as an experiment, just basically study 2-3 days, hardly doing MCQs and SIMs, just read my old Becker textbook, and landed me on the 50s.
Between the old format and the new format, the newer format is tougher, especially for FAR. If you're not a number calculation problem candidate, you'll suffer. The calculation number raised from 50%+(2017Q1) vs. 80%+(2017Q3). I should have passed my Q1, but unfortunately, I ran a few more problems, with SIMs instructions (assuming things).
Anyway, depending on your speed, you'll be fine. Time management is your biggest hurdle during the exam, especially for FAR. As you noticed, most MCQs test banks, 50/50% are number calculation problems and conceptual/theories. Number problems are time consuming. I passed Audit (again) because, it has hardly any number calculations, mostly conceptual/theories.
Since you are using Ninja, you're guaranteed at least their materials are newer. As to Becker/Wiley, I cannot say much, since the last test banks I had was 2014. You can always ask Becker or Ninja if how old/new their MCQs/SIMs materials are. Based on the recent actual exams, no older than 2005 AICPA newly released MCQs exams, since 2004 was the start of computerized CPA exams.
Good luck.