Out of curiosity. Are there articles or some specialist in Learning and disorders? I mean, when I read about OCD, Neurosciences, and anything related to tests and scores. Sometimes I wonder if exams could be biased in the sense that the way questions are phrased or the order could be of any statistical relevance when you want to compare ppl under a normal group and ppl under some specific disorder group.

For ex: some questions about literature can have drawins or pictures, what if a certain group have more advanced or less advanced skills in understading pictures? Now suppose the teacher makes a whole exam where all questions have pictures. What if some student gets a zero score because he or she has some difficulty in understading pictures?