Hello Student  , Being a  PCM group class 12 student if you want to do work as a wildlife biologist  in future then you have to take biology as an additional subject in your 12th class examination.

If you have  biology in your class 12 course then it is possible to take BSc biology honours and then do MSc in life science or biology. After this you have to do a special certificate or diploma course in wildlife biology from any of the Indian University. This course will help you to get a career in wildlife biologist in big NGOs in India or abroad or state governments or central governments job and placement.

Hope this will help.