This is a very good question but to answer this you need to understand a few things which cannot be explained in written answer format.
For the optional subject papers, you need to choose a subject of which you have an in-depth understanding.
The UPSC allows you to choose one from out of a total of 48 different subjects. There’ll be 2 papers, Paper 1 and Paper 2 of 250 marks each pertaining to the subject that you choose. My advice is that you should choose the optional subject after very careful consideration.
I have shared a list of the optional subjects for UPSC Exam 2022, below:
1. Agriculture
2. Anthropology
3. Chemistry
4. Civil Engineering
5. Geography
6. History
Click here to get more information about UPSC Syllabus optional.
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