who signs the exam forms of CA final in following cases?

The student is a pccstream student to be giving CA final. Suppose he can give final exams in november.Form has to be submitted in Aug.
Case I: His articleship ends in July 25 and form 108 signed and submitted by july 31.
Case II: His articleship ends in September16.So form 108 not signed and submitted.

Will another CA having COP (other than his principal or his principal's partner) be able to sign and attest his exam form for Final? in the above cases.