Hello aspirant,

YES, you can apply for PGTRB exam, if you complete Msc Zoology from the correspondence, but that must be from a recognized University. The Maximum age limit for PGTRB exam is 40 years.

The full Eligibility criteria for Pgtrb exam is as follows :

Post Graduate with at least 50% marks (or its equivalent) from a recognized University. Bachelor of Education (B.Ed.) from National Council for Teacher Education recognized institution.

I hope that this will help.