Hello,

It depends on which Examination's application form you are willing to apply many examinations are held twice a year so you can wait for the next session of the exam you can check if there is extension in the submission date of the form on the official website of the organisation which conduct the examination. You can try to contact the officials or people working there to see if they can help you out. In the most unfortunate condition you can take up the examination next year or whenever, it will be conducted again.

All the Best.