The examinee grew nervous after seeing the question paper. Here ‘grew’ is a -

A linking verb joins a subject to a subject complement (also called a predicate noun or predicate adjective), a word or phrase that describes or explains the subject.

Subject + linking verb + Adjective/ Noun (Subjective complement অর্থাৎ যা Subject সম্পর্কেই কোন তথ্য দেয়।)

Linking verb হিসেবে grow অর্থ- হওয়া, পরিণত হওয়া।