I didn’t use the confuser for my PPL – somehow was totally oblivious to it’s existence. As I said with my IMC (where I did use the confuser), I think it’s as close to cheating as you can get – you are almost given the answers, so I am not sure of the real value, which is probably why my instructor didn’t recommend it.
Anyway to answer the original question. The one I failed first time was technical…. I’m just not made that way… I just look at an engine diagram and my eyes simply glaze over
"I just ride 'em, I don't fix 'em"...