Personal preference, I suppose. More than that gets unwieldy, IMO. 100 questions, 60 minutes. Time is of the essence, and honestly, any pilot with a laptop would fit the bill. Google is the real expert.

Read the question, select the first answer that you think fits best, tag it if you're unsure, come back to it if you have time. Skip the time-suck questions until after the first pass.

It works pretty well.