The toughest part for me was learning to read charts and know 100% what all the symbols stood for. The whole upside-down wedding cake thing takes a while to absorb. All the other guidlines and logic was quite straightforward. But for the life of me, I see no reason to know what a line on the airport runway means, when I can't get within miles of an airport. That's just ridiculous, but it's in the test. And why do I need to know if I'm convicted of a marijuana violation that I can't obtain a Part 107 for a year? That helps me ZERO to be a good drone pilot, but it's on the test.