Hello,

I don't think that facility will be there in application form fill up. Mostly forms ask for two mails. If they are not able to contact you through one then they will use the other and send you message on your number to check and verify the mail.

Better to look out guidance from help desk of the board who is conducting the exam. Say your problem and ask for guidance step by step. Do as they say and it will be all set.

Hope it helps!