I finally found my study stride after failing FAR two times.
I go through each chapter and make flash cards for key facts and and work a small problem set (about 10) for each chapter in order to familiarize myself with the content so that I know what is in store.
Then I tackle MCQ like a maniac. I am using Roger so I just work a problem set of 30 for each chapter. For the sections that have the most MCQs, I go back to and start widdling those numbers down (I have noticed that chapters with the most MCQs tend to be the meatiest and tested heavier). I read the solution even if I know I got it right (I get almost none right on the first try my first 1-2 times through the book). Eventually I start getting many right. I will go back and review the chapter in the book or listen through the lecture if I notice I am struggling with a particular topic. I also make flash cards for nitty gritty details I find important or difficult to retain (it doesn't hurt if you accidentally duplicate).
I have never passed a practice test and I rarely work TBs unless I get burnt out on MCQs and need a change for a day.
For AUD you can work many MCQs in a short period. AUD's content is mostly straight forward information, but the questions are designed to be tricky. It is important to not only know the answer in AUD, but understand why every other solution is incorrect (or not AS correct).
I usually spend about 2 weeks making flash cards and procrastinating and 3 weeks of pedal to the metal MCQs (3-6 hours a day). I do work full time.
Granted I have barely passed, but I took my 75s and ran and did it without needing multiple months for each section. I have passed BEC and REG on the first try and just took AUD yesterday.
I hope you find what works best for you. I am hoping that I am 3 for 3. I plan to sit for FAR mid July (I'm taking 5 weeks off from studying since scores won't be released until forever anyhow).