I think the exams are easy for someone who has an engineering / technical education and did well in it, and fairly hard otherwise.
A great deal of the stuff is irrelevant to flying, too. Either because nobody needs to know what year ICAO dates back to, or because things like the slide rule are a very bad way of doing the required computations.
A lot of the answers are also "wrong" in that they make sense in the context of particular Trevor Thom type terminology but someone who knows the subject from a non-PPL angle would have disagreed with the expected correct answer.