Based on the choice of your subject, you may need in-depth knowledge in this paper. Thus, you can consider joining a training institute offering coaching classes for your subject. For instance, when you have chosen Sociology, you will gain benefits from Sociology online classes. You will learn the art of writing high-quality answers in the optional paper.
To read in detail about
Is coaching essential for Sociology optional subject, go through this blog...
Name: Elite IAS Academy
Website:
https://www.eliteias.in/online-coaching/Address: A-1, Chandra House, Top Floor, opp. Icici Bank, Mukherjee Nagar, New Delhi, Delhi 110009, India
Phone: 7065202020