I would start collecting data about the exam performances. Clearly in an anonymous way. Every session there thousend of students who takes exams this means a lot of data that could be used to improve how exams are done/scheduled/…
For example one might believe that having 5 math exams (on consecutive days) and then 5 biology exams (on consecutive days) is much harder than having one math and one biology exam alternated. Or you could see that those lessons that are schedules on Friday morning have higher failure rates because students go out on Thursday night. Once you have the data there are lots of questions that you can try to answer.
