hello,

You are writing in the wrong place. Meet to the faculty member and have a discussion with them. Tell them the reason and ask them to help you out. If it is possible from her/his side then  he/she will do.

If it is end semester examination or any exam which is scheduled by  board officials then it won't get changed. You and your classmates have to prepare in any way possible. Still you can share your concerns to them so that they can help you as much as  possible

Hope it helps!