"Undergraduates will have until May 12, the last day of instruction, to drop a course without a W (“withdrawal”) or to change the grading basis of a course to S/U (‘satisfactory/unsatisfactory’). For more information, see the Spring 2020 grading policy.
Below is the latest information; for the full FAQ, visit the university’s coronavirus resources and updates webpage. The situation is fluid; check back often.
Financial matters for students
Will students receive a refund on tuition?" …
https://news.cornell.edu/stories/2020/04/update-cornell-coronavirus-faq