The way I did it, is I did as many MCQs a day that I could. But don't do as many questions as you can just to tell yourself that you did a bunch. Take the time for each question to learn the concept that it is testing you on. Learn why the answer is what it is.
On my first run through the questions I will go each main section by main section, (not necessarily each subtopic by subtopic). My average was usually not that great during the first run though. After I run through all questions, I will do the exact same thing again. By this time I find I have a good understanding of the concepts and my average is substantially higher.
Having run through all questions twice now, I will target my weaker areas. I do this by doing a custom session with only the section I am weaker in. So in addition to the custom target sessions, I do normal sessions that have random questions from every topic. Eventually getting to the point where I don't need to do custom target sessions and I'm just doing normal sessions to maintain everything that I've learned.
I would usually do around 200 questions a day. AUD was more conceptual so I was able to do them more quickly, around 400 a day. (Obviously I was not able to get through this many questions when I would first start studying for an exam.)
AUD 93 Jan 16
BEC 83 Feb 16
FAR 83 Apr 16
REG 84 May 16
99% Ninja MCQ only