Public Administration as an optional has not been in flavour in recent years and as far as Hindi Medium is concerned, results don’t have much to talk about.
However, with Public Administration being your own subject and if you have good knowledge and command, you can always opt for it as optional subject.
You have enough time to analyse and understand the requirements and should be organized to uplift preparation level that matches with UPSC standards.
To begin with, have a look at the UPSC Main Examination syllabus for Public Administration and the recent years’ question papers to understand the requirements and current trends.
As this is a dynamic subject, you need to read at least 2 newspapers daily. As such, even General Studies preparation requires to be updated and well aware of the events and happening in the world around.
Make a beginning and as you move forward, you will gain lots of insights that will help you in an effective preparation.