I passed REG on my first try in 7 weeks using my version of the NINJA method:
1) Read the book/watch videos and take notes. Your notes don't have to be too detailed, but make sure you are understanding and not just passively listening/reading.
2) Answer all of the NINJA questions. Go subsection by subsection until you have seen all of the questions. I combine some of the tiny subsections Take notes on harder topics and try to understand why your answer was wrong. Don't worry if your average/trending is about 40-60 percent. You are learning by doing with each single MCQ. Also, write about 10pages of NINJA notes every night. You could also rewrite your notes you took on step 1.
3) Take a few days to rewrite all NINJA notess and make flashcards of the concepts (or write down the NINJA flashcards). Write them down though it really helps retain the information rather than just using the app. I wrote mine down, but ended up using the app because my handwriting is terrible, but just writing them down helps. As Christina mentioned, don't worry too much about the numbers. Do not do any MCQs during these few days. Your hands will hurt, but it's worth it.
3) Go through all NINJA MCQs missed in step 2. I went subsection by subsection selecting “missed last time seen”, combining tiny sections if needed. Continue to write down 10 pages of notes every day. You should have your flashcards so go through a section every day. During this step try to spend an equalish amount of time on MCQs and flashcards/notes. Example: I would do MCQs for 1.5hrs and go through one section of flashcards and 10pages of NINJA notes. You are focusing here on learning, memorizing, and understanding the concepts so explain them in your own words to your dog, your cat, your fish, your plant, whoever will listen. You should know the flashcards forwards and backwards. The first time you go through the flashcards will take so long because you don't know the concepts, but it will get better.
4) Go through all NINJA MCQs that you still haven't answered correctly subsection by subsection. Your missed MCQs should be smaller now, so try to alternate between “missed last time seen” and “random”. Continue flashcards and NINJA notes.
5) You should about a 5 days out to your exam and just focus on random MCQs and create a “cheat sheet” of concepts you are struggling with. My “cheat sheet” was usually just going through NINJA notes and writing down everything I still didn't know. Continue to practice your all your flashcards and read your “cheat sheet” every day. Your “cheat sheet” should be no more than 5 pages front and back. You will probably have some MCQs memorized and that's okay as long as you know why the answer is the answer and not just that it's the answer.
6) On the day before the exam read your full NINJA notes and go through every single flashcard. The flashcards shouldn't take very long because you know them so well by now it should take you less than an hour
7) On the day of exam, depending on what time your exam is at, reread your cheat sheet and go through every flashcard again.
8) Pass!
That was my process! I didn't realize how detailed my post was, but I used this for both REG and BEC and passed on the next try. (REG was my first attempt and BEC had failed twice previously 7 months prior).