What do you mean that they are not intuitive? Like rare diseases? Because in most of the question stems, if not all, they give some very specific buzzwords that should make you think of the disease they are asking about, even if it is a VERY rare disease.
I dont know if there are any flashcards out there about those, but the Rapid Review section in the back of the FA book gives a long list of most of the diseases tested and their buzzwords. Reading it through a couple of times for your test might help.
Also, the more questions you practice, the better you are going to get at detecting these rare diseases and their typical presentations.