Hi all- this is what I don't understand about UWorld for Step 3: where are the multiple choice questions for Respiratory? Nephrology? Rheumatology? Or is it that these topics only covered in the forms of CSS cases? I haven't done the multi-system and general principles categories yet, but together they don't even add up to 100 questions, so I was wondering if this is enough to study/practice questions? Any info is welcome, thank you!