Avoid further misunderstandings by reminding students of their responsibilities in your course. For instance, remind them that it is their responsibility to take exams at the scheduled times and to know the location of their exams, to make alternative arrangements in advance if they have a legitimate reason for not being able to take an exam, and to provide appropriate explanation and documentation if they miss an exam without making prior arrangements. Remind students also of your policies and official University policy on makeup exams. Announce field trips and other special meetings, preferably in class and in writing. Unless it is your custom to return exams, lab reports, papers, and projects, retain all your grading materials for timely review with students both during the semester and after final grades.
Students have the right to discuss their grades with faculty.
They should be apprised of your grading policies, see their work, and hear your evaluation of their work directly.